Chapter 8 (Waves)

Sound waves are of these type

• Longitudinal

• Transverse

• Mechnical

• Electromagnetic

What is the amplitude of this wave?

• 0.03 m.

• 0.04 m.

• 0.05 m

• 0.06 m.

What is the wavelength of this wave?

• 0.030 m

• 0.040 m

• 0.060 m

• 0.080 m

Why must soldiers break their march when crossing a bridge?

• To avoid making too much noise

• To prevent the bridge from resonating

• To maintain discipline

• To save energy

A pipe that is open at both ends has a fundamental frequency of 320 Hz when the speed of sound in air is 331 m/s. What is the length of this pipe?

• 0.52 m

• 0.48 m

• 0.45 m

• 0.50 m

What are the next two harmonics of a pipe open at both ends with a fundamental frequency of 320 Hz?

• 640 Hz and 960 Hz

• 480 Hz and 640 Hz

• 320 Hz and 480 Hz

• 960 Hz and 1280 Hz

A closed pipe has a fundamental frequency of 320 Hz when the speed of sound in air is 331 m/s. What is the length of this pipe?

• 0.26 m

• 0.52 m

• 0.41 m

• 0.83 m

For a closed pipe with a fundamental frequency of 320 Hz, what is the third harmonics?

• 1600 Hz

• 2240 Hz

• 960 Hz

• 640 Hz

When two tuning forks of 132 Hz and 137 Hz, respectively, are sounded simultaneously, how many beats are heard?

• 5 beats

• 3 beats

• 7 beats

• 9 beats

What happens to the frequency when the source and detector are moving towards each other?

• Frequency shifts higher

• Frequency shifts lower

• Frequency remains the same

• Frequency becomes zero