Chapter 19-20

to say that one wave is out of phase with another is to say that the waves are a) of different frequencies b) of different amplitudes c)of different wavelengths d) out of step e) all of these

the explanation for refraction must involve a change in A) frequancy B) speed c) wavelength d) all of the above choices are true e) none of the above choices are true

a fishing-boat captain returns to port saying, " its rough out there-the waves are 4 meters high" he probably means that the amplitudes of the waves is A)3m B) 2 m c) 1 m d) 4 m

in the case of radio , which has the higher frequency ? A) sound wave B)carrier wave C)neither.both may be of the same frequency.

if the frequency of a certain wave is 10 hertz,its period is A)100 sec B) 0.1 sec C) 10 sec D) none of the choices are true

An observer on the ground hears a sonic boom which is created by an airplane flying at a speed A) Greater than the speed of sound B) Equal to the speed of sound C) Just below the speed of sound D) None of the choices are true

a standing wave occurs when A) a wave reflects upon it self B) the speed of the wave is zero or near zero C) the amplitude of a wave exeeds its wavelength D) two waves overlap

the energy of sound in air eventually becomes A) cancelled by both destructive and constructive interference B) weaker and weaker untill it disappears C) increased internal energy of the air D)cancelled by destructive interference

the object with the highest natural frequency is a A) small bell B) medium size bell C) large bell

an object that completes 100 vibrations in 5 seconds has a period of A) 1 seconds B) 2 second C) 0.5 second D) None of the above choices are correct

reveberation is actually a case of A) sound interference B)resonance C)re-echoed sound D) forced vibrations E) none of the above

like a transverse wave, a longitudinal wave has

The phenomenon of beats results from sound A) Reflection B) Refraction C) Interference D) All of these E) None of the above

the doppler effect is characteristic of A) sound waves B) light waves C) water waves D) all of the above e) none of the above

The source of every sound is something that is A) Vibrating B) A net emitter of energy C) Moving D) Accelerating E) undergoing simple harmonic motion

a sound wave is a A) longitudinal wave B) transverse wave C) shock wave D) standing wave E) none of the above

some of wave's energy dissipates as heat. in time ,this will reduce the wave's A) period B) frequency C) amplitude D) speed E) wavelength

a floating leaf oscillates up and down two complete cycles in one second as a water wave passes by the wave's wavelenth is 10 meters. what is the wave's speed A) 40 m/s B) 20 m/s C) 10 m/s D) more then 40 m/s E) 2 m/s

double the frequency of sound and you also double its A) speed B) amplitude C) wavelength D) all of these E) none of these

the vibrations of a transverse wave move in a direction A) at right angles to the direction of wave travel B) along the direction of wave travel C) that changes with speed

sound travels faster in air if the air temperature is A)cold B)average C) warm

you dip your finger repeatedly into water and makes waves. if you dip your finger more frequently the wavelength of the waves A)shortens B) lengthens C) stays the same

caruso is siad to have made a crystal shatter with his voice . this is a demonstration of A) beats B) resonance C) An echo D) Interference E) Sound refraction

compressions and rarefactions normaly travel in A) the same direction in a wave B) opposite directions in a wave C) directions that are right angels to the wave direction