Sound

Topics in this chapter

• Sound as Mechanical Waves
• Sound Wave Properties and Measurements
• Human Hearing and Ear Mechanism
• Reflection of Sound and Echoes
• Ultrasound, Infrasound and Applications

Cheat sheet

Practice questions

1. Question 1Q-C9937F

   Which of the following characteristics of sound is determined by its frequency?

   1. A.Loudness
   2. B.Pitch
   3. C.Quality or timbre
   4. D.Speed
   See the answer and solution
2. Question 2Q-385563

   Why can sound waves not travel through a vacuum?

   See the answer and solution
3. Question 3Q-3A7FBB

   What type of waves are sound waves in air?

   1. A.Transverse waves
   2. B.Electromagnetic waves
   3. C.Longitudinal waves
   4. D.Surface water waves
   See the answer and solution
4. Question 4Q-C34507

   If the velocity of a sound wave is $340\text{ m/s}$ and its frequency is $170\text{ Hz}$, what is its wavelength?

   1. A.0.5 m
   2. B.2 m
   3. C.510 m
   4. D.1.5 m
   See the answer and solution
5. Question 5Q-7DC33C

   Define the term 'echo' and state the minimum time gap required between the original sound and the reflected sound to hear a distinct echo in normal air.

   See the answer and solution