Exam 6: Waves and Sound

The loudness of a sound wave is determined by its ______________.

During a thunderstorm, an observer notes that 10 s elapsed between the lightning flash and the sound of the thunder. What is the approximate distance, in miles, from the observer to the lightning?

If the intensity of a sound is increased by a factor of 100, how is the decibel level affected?

Watts per square meter is a unit for measuring the ______________ of a sound wave.

If a sound level increases by 30 dB, the intensity increases by a factor of ______________.

The intensity of a 80-dB whistle is quadrupled. What is the new decibel level?

Which of the following sound frequencies lie(s) outside the audible range?

The region of the electromagnetic spectrum with frequencies just less than those in the visible region is the ______________ region.

The audible range of sound is from 20 Hz to ______________ kHz.

The threshold of hearing is

Which of the following radiations has the smallest wavelength?

A wave is a propagation of ______________.

The intensity of a 50-dB whistle is doubled. What is the new decibel level?

A sound with a frequency of 1000 Hz is in the ______________ region of the sound spectrum.

Which of the following sound frequencies lie(s) in the audible range?

If a piece of ribbon were tied to a stretched string carrying a transverse wave, how would the ribbon be observed to oscillate?

What are the wavelength limits, in meters, of the audible region of the sound spectrum (v = 344 m/s)?

The SI unit of frequency is ______________.

For a standing wave in a rope or string, the points that remain stationary are called ______________.

The Doppler effect is observed only when