Which type of electromagnetic waves would be the best to use in an object designed to cook food?

Question

a
infrared waves
b
microwaves
c
gamma waves
d
visible waves
Question 2 (1 point)
When the pitch of a wave increases, the wavelength of the wave
a
decreases.
b
increases.
c
doubles.
d
stays the same.
Question 3 (1 point)
A student is building a model of a lens that will spread light over the biggest space. Which best describes the type of model the student should make?
a
The student should make a concave lens model because it breaks light down into bands of color.
b
The student should make a concave lens model because it directs light away from the center of the lens.
c
The student should make a convex lens model because it breaks light down into bands of color.
d
The student should make a convex lens model because it directs light away from the center of the lens.
Question 4 (1 point)
A student has to create a model of a convex lens. Which property of a convex lens should the student include in the model?
a
The lens reflects light.
b
The lens spreads light.
c
The lens focuses light.
d
The lens destroys light.
Question 5 (1 point)
Airport security uses electromagnetic waves to see items inside of luggage without having to open the bags. Which type of electromagnetic waves would be best for airport security to use?
a
Radar waves would be best because they are low-energy waves that can penetrate gases.
b
Radar waves would be best because they are high-energy waves that can penetrate solids.
c
X-rays would be best because they are high-energy waves that can penetrate solids.
d
X-rays would be best because they are low-energy waves that can penetrate gases.
Question 6 (1 point)
Why would a baseball player see a baseball flying through the air before he hears the crack of the ball on the bat?
a
because sound travels slower through air than light
b
because light and sound travel at the same speed through air
c
because sound travels faster through air than light
d
because light and sound must travel through matter to be seen
Question 7 (1 point)
Rachel is learning about electromagnetic radiation that comes from the Sun. What types of electromagnetic radiation does the Sun emit?
a
gamma rays and ultraviolet radiation
b
ultraviolet radiation, only
c
all types of electromagnetic radiation
d
infrared, visible, and ultraviolet radiation
Question 8 (1 point)
A student is investigating two transverse waves. One of the waves is electromagnetic and the other wave is mechanical. Which question would best help the student identify each wave as either electromagnetic or mechanical?
a
Which wave can travel through air?
b
What type of energy is transferred by each wave?
c
Which wave has more energy?
d
What direction does each of the waves travel?
Question 9 (1 point)
Which of the following statements best describes the relationship between wavelength and frequency?
a
The shorter the wavelength, the weaker the frequency.
b
The longer the wavelength, the higher the frequency.
c
The shorter the wavelength, the lower the frequency.
d
The longer the wavelength, the lower the frequency.
Question 10 (1 point)
A television remote control is used to direct pulses of electromagnetic radiation to a receiver on a television. What does this communication between the remote control and the television illustrate about electromagnetic radiation?
a
It transfers energy without transferring mass.
b
It is a longitudinal wave.
c
It diffracts and accelerates in air.
d
It possesses energy inversely proportional to its frequency.
Question 11 (1 point)
The diagram below represents a transverse wave.

The wavelength of this wave is equal to the distance between which two points?
c47b9088-3cb7-473c-b070-f5ec409b98f6

a
D and F
b
C and E
c
A and G
d
B and F
Question 12 (1 point)
What happens when light waves travel from air through a denser medium?
a
They continue to travel in a straight line.
b
They will slow down and bend.
c
They will speed up and bend.
d
They continue to travel in a zigzag line.
Question 13 (1 point)
Some frequencies of ultraviolet light have enough energy to kill bacteria and viruses, but do not have enough energy to penetrate or damage human tissue. For which one of the following medical applications would this type of electromagnetic radiation be most useful?

a
to disinfect surgical rooms
b
to restructure a tooth
c
to target and kill cancer cells
d
to correct errors in vision
Question 14 (1 point)
Describe how a light wave changes as it travels from the air into water.
a
It speeds up because water is less dense than air.
b
It slows down because water is more dense than air.
c
It speeds up because water is more dense than air.
d
It slows down because water is less dense than air.
Question 15 (1 point)
Correctly order the parts of the electromagnetic spectrum from shortest wavelength to longest wavelength.
Reorder answers
1.visible
Reorder answers
2.x-ray
Reorder answers
3.gamma ray
Reorder answers
4.ultraviolet
Reorder answers
5.radio
Reorder answers
6.infrared
Reorder answers
7.microwave
Question 16 (1 point)
On a guitar, the longest string vibrates slowly, and the shortest string vibrates very quickly. What conclusion can be made about the sound that each string makes?
a
The long string makes a soft sound and the short string makes a loud sound, because things that are longer make softer sounds.
b
The long string makes a low-pitched sound and the short string makes a high-pitched sound, because things that vibrate slowly have a lower pitch.
c
The long string makes a loud sound and the short string makes a soft sound, because things that are longer make louder sounds.
d
The long string makes a high-pitched sound and the short string makes a low-pitched sound, because things that vibrate slowly have a higher pitch.
Question 17 (1 point)
Mac and Suzanne cut holes in the bottom of two cups and connect them with a string. When Mac whispers into one cup, Suzanne can hear him through the other. What is the best reason to explain why this happens?
a
Sound waves can travel great distances.
b
Sound waves from whispering have a higher frequency.
c
Sound waves produce an echo.
d
Sound waves travel better through solids than gases.
Question 18 (1 point)
Select all of the following that are correct about mechanical waves.
a
They are composed of high energy particles.
b
They can propagate in a physical medium.
c
They can propagate in a vacuum.
d
They transfer energy from particle to particle.
e
They can be longitudinal.
f
They can be transverse.
Question 19 (1 point)
Different colors absorb and reflect different amounts of sunlight. Which color would make the most sense to use to paint a house to keep it cool in Florida?
a
dark blue
b
red
c
pale yellow
d
black
Question 20 (1 point)
What causes light to slow down?
a
moving into a less adhesive medium
b
moving into a denser medium
c
moving into a vacuum
d
moving into a lighter medium

Answer 1

b
moving into a denser medium