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Homework exercises on Sound for a Physical Science course.  Also refer to physics, light, waves, wave motion, sonic, ears, hearing, WBT, education, distance learning, Ron Kurtus, School for Champions. Copyright © Restrictions

Sound Waves - Homework Answers

After you have completed the Sound Homework, you can refer to these answers. Although it is better to have known the answer from your reading, the process of writing the correct answer on your homework sheet will help you remember the concepts.

1. Name 3 sources of sound.

Voice, radio, TV, wind, explosions, etc.

2. Name 2 things that detect sound.

Ears, microphone, can feel some sound 

3. Sound is a compression or transverse waveform?

Compression.

4. What is the relationship between wavelength, velocity, and frequency?

Velocity = wavelength x frequency.

5. How do we perceive the amplitude of a sound wave?

As loudness.

6. The pitch in a sound wave is the same as what?

Either frequency or wavelength is correct.

7. Give two examples where the human ear cannot detect a sound.

Real high notes or very low volume. Also very low frequencies.

8. What determines the velocity of sound waves?

The density of the material it travels in..

9. If thunder and lightening occur at the same time, why do you see the lightening before you hear the thunder?

Light travels much faster than sound.

10. How long would it take the sound from lightning 2 miles away to reach you?

About 10 seconds.

11. How fast does sound travel in outer space?

Sound cannot travel in empty space. Sound needs matter to travel in.

12. What is the name of the effect that causes the pitch of an ambulance siren to change as it passes you?

Doppler effect

13. What causes an echo?

Reflection of sound wave.

14. How do fishermen use echoes?

They use sonar to detect fish underwater.

15. What could happen if a sound was in resonance with a glass?

It could break the glass.

Where can you go from here?