Exam 6: Waves and Sound

The frequency and the wavelength of a wave are ______________ proportional.

When a jet plane exceeds the speed of sound,a(n)______________ forms,resulting in a sonic boom.

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

The intensity of a 70-dB whistle is doubled.What is the new decibel level?

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?

A sound level of 93 dB is how many times as intense as one of 73 dB?

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

A sound wave in air travels at a speed of 340 m/s.If the wavelength is 0.100 m,in what range of the sound spectrum is the wave?

A pendulum has how many natural frequencies?

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

If a wave has a frequency of 6 Hz,it has a period of

An observer moving toward a stationary sound source hears a(n)______________ in frequency.

Wave frequency is inversely proportional to

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

A sound level of 19 dB is how many times as intense as one of 10 dB?

If a sound level increases by 40 dB,the intensity increases by a factor of ______________.

The Doppler effect is observed only when

When a system is being driven at a natural frequency,it is said to be driven in ______________.

The region of the electromagnetic spectrum with wavelengths just less than those in the ultraviolet region is the ______________ region.

A particular sound with large intensity is reduced 1000-fold.What is the decibel reduction?