Sound Quiz

Which is the best choice to amplify a sound?

• soundproofing insulation

• underwater sonic substratum echo mechanism

• tuning fork

• resonance tube

The sound from a train approaching you is higher in pitch than the sound from a train moving away from you. This is an example of

• supersonic motion.

• the Fourier theorem.

• the law of superposition.

• the Doppler effect.

Two loudspeakers play different notes, one at 440 Hz and the other at 430 Hz. What will a listener hear when these notes interfere?

• refraction

• beats

• reverberation

• diffraction

Which is not an example of resonance of sound?

• a tuning fork

• sounding a note by blowing air over a bottle

• playing a trombone

• a laser

A 3 m sound wave is traveling in air at 343 m/s when it enters water, where the speed of sound is 1,482 m/s. If you assume that the wave loses no energy entering the water, what is its wavelength in water?

• 13 m

• 494 m

• 4.3 m

• 114 m