Question
A fire truck emits sound waves at a constant frequency. An observer stands several blocks away. Which statement best describes the sound waves perceived by the observer as the fire truck approaches?
*
1 point
The wavelength and frequency both decrease.
The wavelength decreases and the frequency increases.
The frequency and wavelength remain the same.
The wavelength increases and the frequency decreases.
The table shows the speed of sound in different media. A sound wave travels through the air, then into a glass block. Assuming frequency remains the same, how is the wavelength affected?
*
1 point
Captionless Image
It increases.
It remains the same.
It decreases.
It increases then decreases.
Read the passage about echolocation. " Echolocation is used by some animals, such as whales and bats, to find the location of objects by sending out sound waves through a medium. The length of time it takes for the sound wave to strike an object and bounce back tells the location of the object." How would the length of time it takes a sound wave to return to a whale differ from the time it takes a sound wave to return to a bat?
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1 point
A sound wave would return faster to a bat because sound travels faster in air than it does in water.
A sound wave would return faster to a bat because the wavelength is shorter in air than in water.
A sound wave would return faster to a whale because sound travels faster in water than it does in air.
A sound wave would return faster to a whale because the wavelength is longer in water than in air.
Which of the following diagrams best represents the reflection of wavelengths off a barrier?
*
1 point
a.
b.
c.
d.
Kaiden is watching ocean wave fronts move past a barrier. He notes that the waves bend past the corner of the barrier, and he sketches the diagram below. Kaiden uses this observation to model how the wave fronts would travel if a second barrier was added. Which of the following models shows this?
*
1 point
Captionless Image
a.
b.
c.
d.
An engineer is designing a concert hall. The points on the diagram show potential placement of seats. Which phenomena would be experienced at seat 3?
*
1 point
Captionless Image
Refraction
Destructive interference
Reflection
Constructive interference
*
1 point
The wavelength and frequency both decrease.
The wavelength decreases and the frequency increases.
The frequency and wavelength remain the same.
The wavelength increases and the frequency decreases.
The table shows the speed of sound in different media. A sound wave travels through the air, then into a glass block. Assuming frequency remains the same, how is the wavelength affected?
*
1 point
Captionless Image
It increases.
It remains the same.
It decreases.
It increases then decreases.
Read the passage about echolocation. " Echolocation is used by some animals, such as whales and bats, to find the location of objects by sending out sound waves through a medium. The length of time it takes for the sound wave to strike an object and bounce back tells the location of the object." How would the length of time it takes a sound wave to return to a whale differ from the time it takes a sound wave to return to a bat?
*
1 point
A sound wave would return faster to a bat because sound travels faster in air than it does in water.
A sound wave would return faster to a bat because the wavelength is shorter in air than in water.
A sound wave would return faster to a whale because sound travels faster in water than it does in air.
A sound wave would return faster to a whale because the wavelength is longer in water than in air.
Which of the following diagrams best represents the reflection of wavelengths off a barrier?
*
1 point
a.
b.
c.
d.
Kaiden is watching ocean wave fronts move past a barrier. He notes that the waves bend past the corner of the barrier, and he sketches the diagram below. Kaiden uses this observation to model how the wave fronts would travel if a second barrier was added. Which of the following models shows this?
*
1 point
Captionless Image
a.
b.
c.
d.
An engineer is designing a concert hall. The points on the diagram show potential placement of seats. Which phenomena would be experienced at seat 3?
*
1 point
Captionless Image
Refraction
Destructive interference
Reflection
Constructive interference
Answers
GPT-4o mini
1. **As the fire truck approaches, which statement best describes the sound waves?**
- **Answer:** The wavelength decreases and the frequency increases.
- **Explanation:** This phenomenon is known as the Doppler effect. As the source of sound (fire truck) moves closer, the frequency that an observer perceives increases (higher pitch), and the wavelength decreases.
2. **How is the wavelength affected as a sound wave travels from air into a glass block?**
- **Answer:** It decreases.
- **Explanation:** When sound enters a denser medium (like glass from air), the speed of sound decreases while frequency remains constant, resulting in a shorter wavelength.
3. **How does the length of time it takes for a sound wave to return differ for a whale and a bat?**
- **Answer:** A sound wave would return faster to a whale because sound travels faster in water than it does in air.
- **Explanation:** Sound travels significantly faster in water (about 1500 m/s) compared to air (about 343 m/s), leading to a shorter return time for a whale's echolocation.
4. **Which diagram best represents the reflection of wavelengths off a barrier?**
- Diagrams are not provided here, but typically you'd look for a diagram that shows incoming waves meeting a barrier and bouncing back, illustrating the change in direction.
5. **Which model shows how wave fronts would travel if a second barrier was added, based on Kaiden's observation?**
- Again, without seeing the diagrams, choose the one that illustrates the continuation and bending of wave fronts as they encounter a second barrier in relation to the first.
6. **What phenomena would be experienced at seat 3 in the concert hall diagram?**
- **Answer:** Constructive interference.
- **Explanation:** In concert halls, sound waves from different sources can interact. Constructive interference occurs when sound waves from different directions add up (in phase), making the sound louder at certain points, potentially including seat 3.
If you can provide the specific diagrams or images for the reflection and model questions, I can help you interpret which ones are correct!
- **Answer:** The wavelength decreases and the frequency increases.
- **Explanation:** This phenomenon is known as the Doppler effect. As the source of sound (fire truck) moves closer, the frequency that an observer perceives increases (higher pitch), and the wavelength decreases.
2. **How is the wavelength affected as a sound wave travels from air into a glass block?**
- **Answer:** It decreases.
- **Explanation:** When sound enters a denser medium (like glass from air), the speed of sound decreases while frequency remains constant, resulting in a shorter wavelength.
3. **How does the length of time it takes for a sound wave to return differ for a whale and a bat?**
- **Answer:** A sound wave would return faster to a whale because sound travels faster in water than it does in air.
- **Explanation:** Sound travels significantly faster in water (about 1500 m/s) compared to air (about 343 m/s), leading to a shorter return time for a whale's echolocation.
4. **Which diagram best represents the reflection of wavelengths off a barrier?**
- Diagrams are not provided here, but typically you'd look for a diagram that shows incoming waves meeting a barrier and bouncing back, illustrating the change in direction.
5. **Which model shows how wave fronts would travel if a second barrier was added, based on Kaiden's observation?**
- Again, without seeing the diagrams, choose the one that illustrates the continuation and bending of wave fronts as they encounter a second barrier in relation to the first.
6. **What phenomena would be experienced at seat 3 in the concert hall diagram?**
- **Answer:** Constructive interference.
- **Explanation:** In concert halls, sound waves from different sources can interact. Constructive interference occurs when sound waves from different directions add up (in phase), making the sound louder at certain points, potentially including seat 3.
If you can provide the specific diagrams or images for the reflection and model questions, I can help you interpret which ones are correct!