Question
1.
Check all that apply. The mechanisms of heat transfer that need a medium are:
Fusion
Radiation
Conduction
Convection
2. Which rules of ray tracing apply to diverging lenses?
A ray that travels toward the focal point on the other side of the lens will refract so that the ray travels parallel to the principal axis.
A ray that passes through the center of the lens and then parallel to the optical axis on the other side of the lens.
A ray that comes in to the lens parallel to the principle axis will refract in a direction so that the extension of the ray in front of the lens passes through the focal point on the same side of the lens as the object.
A ray that passes through the center of the lens will continue in that same direction.
3.
The focal distance for a convex lens is 80 cm. What kind of image is produced when the object distance is greater than 160 cm?
inverted and smaller
upright and smaller
upright and larger
inverted and larger
4. Temperature is defined as:
potential energy
heat energy
how hot or cold something is
mechanical energy
5. The Celsius and Kelvin scales are useful because:
Fahrenheit is an old scale.
there are two of them.
they sound more official outside of the U.S.A.
they are based off natural physical phenomena.
6. Convert 212 K to Fahrenheit.
-100°F
78°F
-178°F
-78°F
7.
A concave mirror creates an image which is magnified by a factor of 5. The image is 0.1 meters away the mirror. What is the object distance?
0.5 meters
0.02 meters
0.2 meters
0.1 meters
8. Which of the below are types of energy? Check all that apply.
Heat
Potential
Momentum
Kinetic
9. Which type of mirror always gives an image which is the same size as the object?
concave mirror
flat mirror
diffuse mirror
convex mirror
10. Magenta light shines on a green shirt. What color of light would you expect to be reflected?
Blue
Green
None
Cyan
11. Water has the highest density in which phase?
Plasma
Gas
Liquid
Solid
12. A converging lens has a focal length of 15 cm. Suppose an object is placed 40 cm in front of the lens. a) What is the image distance? b) What is the magnification of the image?
a) 20 cm b) -0.8
a) 34 cm b) -0.2
a) 24 cm b) -0.6
a) 28 cm b) -0.6
13. Your hand is wrapped around a cold iron bar. Your hand has 1000 J of thermal energy before touching the bar and 900 J after holding the bar for a minute. How much energy has the bar gained in the time of contact?
900 J
100 J
1000 J
1900 J
14.
Choose any that apply. Most objects that are heated have a:
higher volume
lower volume
higher density
lower density
15 How many rays do you need to draw in order to find the image created by a curved mirror?
1
2
5
3
16. A bi-metallic strip is a strip with two pieces of:
aluminum that absorb heat efficiently.
metal that expand the same amount when heated.
plastic that melt at different temperatures.
metal that expand by different amounts when heated.
17 Convert 212°C to Fahrenheit.
143°F
413°F
100°F
314°F
18. White light shines through a cyan filter. After the filter, a red light bulb shines on the new color of light. What color is the final resulting light, after the red light has been added to it?
black
yellow
white
purple
19 he zeroth law of thermodynamics relates to:
three objects with the same heat energy
three objects being in thermal equilibrium
three objects with different heat energy
three objects not in thermal equilibrium
20
A ray of light leaves air (n = 1) and enters glass (n = 1.5). Once inside the glass, the light is at an angle of 30° relative to the normal. What angle did it enter the glass relative to the normal?
58.5 degrees
24.5 degrees
48.5 degrees
34.5 degrees
21
A curved mirror takes a 0.05 m tall object and shrinks the image to a height of 0.02 meters. What is the ratio of image distance to object distance?
0.07
0.05
0.4
0.02
22.
An electromagnetic wave is:
all light that is not visible to the human eye.
a bit of radiation that could cause health problems.
a sonar wave that travels at about the speed of light.
a two-dimensional wave that does not need a medium to travel.
23Which statements below best describes colors. Check any that apply.
white light is the combination of red, green, and blue light
white pigment is the absorption of red, green, and blue light
black pigment is the absorption of red, green, and blue light
black pigment is the reflection of red, green, and blue light
24Why do you think blacksmiths must have such hot fires to forge steel?
Because metals are able to deflect heat and so need a hot fire.
Because metals are naturally cold, and so need a hot fire.
Because metals are brittle and so need a hot fire.
Because metals absorb lots of heat, and so need a hot fire.
Check all that apply. The mechanisms of heat transfer that need a medium are:
Fusion
Radiation
Conduction
Convection
2. Which rules of ray tracing apply to diverging lenses?
A ray that travels toward the focal point on the other side of the lens will refract so that the ray travels parallel to the principal axis.
A ray that passes through the center of the lens and then parallel to the optical axis on the other side of the lens.
A ray that comes in to the lens parallel to the principle axis will refract in a direction so that the extension of the ray in front of the lens passes through the focal point on the same side of the lens as the object.
A ray that passes through the center of the lens will continue in that same direction.
3.
The focal distance for a convex lens is 80 cm. What kind of image is produced when the object distance is greater than 160 cm?
inverted and smaller
upright and smaller
upright and larger
inverted and larger
4. Temperature is defined as:
potential energy
heat energy
how hot or cold something is
mechanical energy
5. The Celsius and Kelvin scales are useful because:
Fahrenheit is an old scale.
there are two of them.
they sound more official outside of the U.S.A.
they are based off natural physical phenomena.
6. Convert 212 K to Fahrenheit.
-100°F
78°F
-178°F
-78°F
7.
A concave mirror creates an image which is magnified by a factor of 5. The image is 0.1 meters away the mirror. What is the object distance?
0.5 meters
0.02 meters
0.2 meters
0.1 meters
8. Which of the below are types of energy? Check all that apply.
Heat
Potential
Momentum
Kinetic
9. Which type of mirror always gives an image which is the same size as the object?
concave mirror
flat mirror
diffuse mirror
convex mirror
10. Magenta light shines on a green shirt. What color of light would you expect to be reflected?
Blue
Green
None
Cyan
11. Water has the highest density in which phase?
Plasma
Gas
Liquid
Solid
12. A converging lens has a focal length of 15 cm. Suppose an object is placed 40 cm in front of the lens. a) What is the image distance? b) What is the magnification of the image?
a) 20 cm b) -0.8
a) 34 cm b) -0.2
a) 24 cm b) -0.6
a) 28 cm b) -0.6
13. Your hand is wrapped around a cold iron bar. Your hand has 1000 J of thermal energy before touching the bar and 900 J after holding the bar for a minute. How much energy has the bar gained in the time of contact?
900 J
100 J
1000 J
1900 J
14.
Choose any that apply. Most objects that are heated have a:
higher volume
lower volume
higher density
lower density
15 How many rays do you need to draw in order to find the image created by a curved mirror?
1
2
5
3
16. A bi-metallic strip is a strip with two pieces of:
aluminum that absorb heat efficiently.
metal that expand the same amount when heated.
plastic that melt at different temperatures.
metal that expand by different amounts when heated.
17 Convert 212°C to Fahrenheit.
143°F
413°F
100°F
314°F
18. White light shines through a cyan filter. After the filter, a red light bulb shines on the new color of light. What color is the final resulting light, after the red light has been added to it?
black
yellow
white
purple
19 he zeroth law of thermodynamics relates to:
three objects with the same heat energy
three objects being in thermal equilibrium
three objects with different heat energy
three objects not in thermal equilibrium
20
A ray of light leaves air (n = 1) and enters glass (n = 1.5). Once inside the glass, the light is at an angle of 30° relative to the normal. What angle did it enter the glass relative to the normal?
58.5 degrees
24.5 degrees
48.5 degrees
34.5 degrees
21
A curved mirror takes a 0.05 m tall object and shrinks the image to a height of 0.02 meters. What is the ratio of image distance to object distance?
0.07
0.05
0.4
0.02
22.
An electromagnetic wave is:
all light that is not visible to the human eye.
a bit of radiation that could cause health problems.
a sonar wave that travels at about the speed of light.
a two-dimensional wave that does not need a medium to travel.
23Which statements below best describes colors. Check any that apply.
white light is the combination of red, green, and blue light
white pigment is the absorption of red, green, and blue light
black pigment is the absorption of red, green, and blue light
black pigment is the reflection of red, green, and blue light
24Why do you think blacksmiths must have such hot fires to forge steel?
Because metals are able to deflect heat and so need a hot fire.
Because metals are naturally cold, and so need a hot fire.
Because metals are brittle and so need a hot fire.
Because metals absorb lots of heat, and so need a hot fire.
Answers
GPT-4o mini
Here are the answers to your questions:
1. **Check all that apply. The mechanisms of heat transfer that need a medium are:**
- **Conduction**
- **Convection**
(Note: Fusion is a phase change, and radiation does not require a medium.)
2. **Which rules of ray tracing apply to diverging lenses?**
- A ray that comes in to the lens parallel to the principal axis will refract in a direction so that the extension of the ray in front of the lens passes through the focal point on the same side of the lens as the object.
- A ray that passes through the center of the lens will continue in that same direction.
3. **The focal distance for a convex lens is 80 cm. What kind of image is produced when the object distance is greater than 160 cm?**
- **inverted and smaller**
4. **Temperature is defined as:**
- **how hot or cold something is**
5. **The Celsius and Kelvin scales are useful because:**
- **they are based off natural physical phenomena.**
6. **Convert 212 K to Fahrenheit.**
- **-60°F** (Formula: \( F = \frac{9}{5}(K - 273) + 32 \); plug in \( K = 212 \))
7. **A concave mirror creates an image which is magnified by a factor of 5. The image is 0.1 meters away from the mirror. What is the object distance?**
- **0.5 meters** (Magnification = image distance / object distance; therefore, object distance = image distance / magnification)
8. **Which of the below are types of energy? Check all that apply.**
- **Heat**
- **Potential**
- **Kinetic**
9. **Which type of mirror always gives an image which is the same size as the object?**
- **flat mirror**
10. **Magenta light shines on a green shirt. What color of light would you expect to be reflected?**
- **None** (The green shirt absorbs other colors and reflects green, which is not present in magenta light.)
11. **Water has the highest density in which phase?**
- **Liquid**
12. **A converging lens has a focal length of 15 cm. Suppose an object is placed 40 cm in front of the lens. a) What is the image distance? b) What is the magnification of the image?**
- **a) 24 cm b) -0.6** (Using the lens formula \( \frac{1}{f} = \frac{1}{d_o} + \frac{1}{d_i} \) results in a calculated image distance of 24 cm and magnification can be calculated afterward.)
13. **Your hand is wrapped around a cold iron bar. Your hand has 1000 J of thermal energy before touching the bar and 900 J after holding the bar for a minute. How much energy has the bar gained in the time of contact?**
- **100 J** (Energy lost by hand = energy gained by bar.)
14. **Choose any that apply. Most objects that are heated have a:**
- **higher volume**
- **lower density**
15. **How many rays do you need to draw in order to find the image created by a curved mirror?**
- **2**
16. **A bi-metallic strip is a strip with two pieces of:**
- **metal that expand by different amounts when heated.**
17. **Convert 212°C to Fahrenheit.**
- **414°F** (Formula: \( F = \frac{9}{5}(C) + 32 \); plug in \( C = 212 \))
18. **White light shines through a cyan filter. After the filter, a red light bulb shines on the new color of light. What color is the final resulting light, after the red light has been added to it?**
- **None** (The cyan filter removes red light, so adding red back will neutralize the light resulting in none.)
19. **The zeroth law of thermodynamics relates to:**
- **three objects being in thermal equilibrium**
20. **A ray of light leaves air (n = 1) and enters glass (n = 1.5). Once inside the glass, the light is at an angle of 30° relative to the normal. What angle did it enter the glass relative to the normal?**
- **19.19 degrees** (Use Snell's Law: \( n_1 \sin(\theta_1) = n_2 \sin(\theta_2) \))
21. **A curved mirror takes a 0.05 m tall object and shrinks the image to a height of 0.02 meters. What is the ratio of image distance to object distance?**
- **0.4**
22. **An electromagnetic wave is:**
- **a two-dimensional wave that does not need a medium to travel.**
23. **Which statements below best describes colors. Check any that apply.**
- **white light is the combination of red, green, and blue light**
- **black pigment is the absorption of red, green, and blue light**
24. **Why do you think blacksmiths must have such hot fires to forge steel?**
- **Because metals absorb lots of heat, and so need a hot fire.**
Feel free to let me know if you need any further clarification on any answer!
1. **Check all that apply. The mechanisms of heat transfer that need a medium are:**
- **Conduction**
- **Convection**
(Note: Fusion is a phase change, and radiation does not require a medium.)
2. **Which rules of ray tracing apply to diverging lenses?**
- A ray that comes in to the lens parallel to the principal axis will refract in a direction so that the extension of the ray in front of the lens passes through the focal point on the same side of the lens as the object.
- A ray that passes through the center of the lens will continue in that same direction.
3. **The focal distance for a convex lens is 80 cm. What kind of image is produced when the object distance is greater than 160 cm?**
- **inverted and smaller**
4. **Temperature is defined as:**
- **how hot or cold something is**
5. **The Celsius and Kelvin scales are useful because:**
- **they are based off natural physical phenomena.**
6. **Convert 212 K to Fahrenheit.**
- **-60°F** (Formula: \( F = \frac{9}{5}(K - 273) + 32 \); plug in \( K = 212 \))
7. **A concave mirror creates an image which is magnified by a factor of 5. The image is 0.1 meters away from the mirror. What is the object distance?**
- **0.5 meters** (Magnification = image distance / object distance; therefore, object distance = image distance / magnification)
8. **Which of the below are types of energy? Check all that apply.**
- **Heat**
- **Potential**
- **Kinetic**
9. **Which type of mirror always gives an image which is the same size as the object?**
- **flat mirror**
10. **Magenta light shines on a green shirt. What color of light would you expect to be reflected?**
- **None** (The green shirt absorbs other colors and reflects green, which is not present in magenta light.)
11. **Water has the highest density in which phase?**
- **Liquid**
12. **A converging lens has a focal length of 15 cm. Suppose an object is placed 40 cm in front of the lens. a) What is the image distance? b) What is the magnification of the image?**
- **a) 24 cm b) -0.6** (Using the lens formula \( \frac{1}{f} = \frac{1}{d_o} + \frac{1}{d_i} \) results in a calculated image distance of 24 cm and magnification can be calculated afterward.)
13. **Your hand is wrapped around a cold iron bar. Your hand has 1000 J of thermal energy before touching the bar and 900 J after holding the bar for a minute. How much energy has the bar gained in the time of contact?**
- **100 J** (Energy lost by hand = energy gained by bar.)
14. **Choose any that apply. Most objects that are heated have a:**
- **higher volume**
- **lower density**
15. **How many rays do you need to draw in order to find the image created by a curved mirror?**
- **2**
16. **A bi-metallic strip is a strip with two pieces of:**
- **metal that expand by different amounts when heated.**
17. **Convert 212°C to Fahrenheit.**
- **414°F** (Formula: \( F = \frac{9}{5}(C) + 32 \); plug in \( C = 212 \))
18. **White light shines through a cyan filter. After the filter, a red light bulb shines on the new color of light. What color is the final resulting light, after the red light has been added to it?**
- **None** (The cyan filter removes red light, so adding red back will neutralize the light resulting in none.)
19. **The zeroth law of thermodynamics relates to:**
- **three objects being in thermal equilibrium**
20. **A ray of light leaves air (n = 1) and enters glass (n = 1.5). Once inside the glass, the light is at an angle of 30° relative to the normal. What angle did it enter the glass relative to the normal?**
- **19.19 degrees** (Use Snell's Law: \( n_1 \sin(\theta_1) = n_2 \sin(\theta_2) \))
21. **A curved mirror takes a 0.05 m tall object and shrinks the image to a height of 0.02 meters. What is the ratio of image distance to object distance?**
- **0.4**
22. **An electromagnetic wave is:**
- **a two-dimensional wave that does not need a medium to travel.**
23. **Which statements below best describes colors. Check any that apply.**
- **white light is the combination of red, green, and blue light**
- **black pigment is the absorption of red, green, and blue light**
24. **Why do you think blacksmiths must have such hot fires to forge steel?**
- **Because metals absorb lots of heat, and so need a hot fire.**
Feel free to let me know if you need any further clarification on any answer!