Physical Science Final Exam: Wave, Sound, and Light

if the frequency of a particular wave is 20 Hz, what is its period?

1/20 sec

The range of human hearing is about

20 Hz - 20,000 Hz

an electric razor completes 50 vibrations in 1 sec. what is the frequency of these vibrations?

50 Hz with a period of 1/50 sec

a whitish sky is evidence that the atmosphere contains

a mixture of particle sizes

the source of all waves is

a vibration

materials generally become warmer when light is

absorbed by them

the reason that a surface appears darker when wet has to do with

absorption of light re-reflecting inside the wet region

the speed of a sound wave in air depends on

air temperature

interference is a property of

all wave motion (sound + light)

________ is the distance from the midpoint to the peak of a wave

amplitude

a Doppler effect occurs when a a source of sound moves

both toward and away from you

in _________ interference, the crests of the waves overlap, amplitude increases, and results in reinforcement

constructive

the two kinds of interference are

constructive and destructive

in _________ interference, the crest of one wave overlaps the trough of the other resulting in cancellation

destructive

_________ __________ is when sound or light is incident on a rough surface and it is reflected in may directions

diffuse reflection

the source of electromagnetic waves is vibrating

electric charges

different colors of light correspond to different light

frequencies

when a fire engine approaches you, the _________ of its sound increases

frequency

compressions and refractions normally travel in which direction relative to a wave?

in the same direction as wave

_____________ is the combined effect of two or more overlapping waves

interference

_________ travels nearly a million times faster than ________ in air

light; sound

sound waves and seismic P-waves (earthquake + explosion) are __________ waves

longitudinal

a wave barrier is produced in water when the speed of an object

matches the speed of waves in water

the vibrations along a longitudinal wave move in a direction

parallel to the wave

when we consider the time taken for a pendulum to swing to and fro we're talking about its ____________

period

the vibrations along a transverse wave move in a direction

perpendicular to the wave

a sound source of high frequency emits a high ________

pitch

the frequency of sound is called

pitch

reverberation is a case of

re-echoed sound

the 3 colors that compromise the image on the TV screen are

red, blue, and green

____________ is when sound encounters a surface and is returned

reflection

a mirage is a result of atmospheric

refraction

_________ occurs whenever successive impulses are applied to a vibrating object in rhythm with its natural frequency

resonance

multiple reflections are called

reverberations

because of refraction, a person standing waist deep in a swimming pool appears to have _______ legs

shorter

the natural frequency of an object depends on its

size, shape, and elasticity

Is sound, radio, or light a longitudinal wave?

sound

the Doppler effect occurs for

sound and light

a bass fiddle is louder than a harp because of its

sounding board

refraction results from differences in light's

speed

the colors dispersed by a prism are due to different light

speeds inside the prism

red sunsets are due to are due to light of lower frequencies that

survive being scattered in the air

a wave is a vibration in _________ and _________

time; space

the medium in which a wave travels __________ the wave

transmits

the fact that you can get sunburned while submerged in water is evidence that water

transmits ultraviolet light

electromagnetic waves (radio + light) and seismic S-waves are ___________ waves

transverse

when sound travels faster at ground level than higher in the air, sound tends to bend

upward

does light travel faster in a vacuum, warm air, or cool air?

vacuum

both sound and light can travel in _____ but not ______

water; vacuum

the distance between the adjacent peaks in the direction of travel for a transverse wave is called its

wavelength

why is seeing difficult when driving at night on a wet road, as opposed to a dry road?

wet surface is smooth with less diffuse reflection, part of which would otherwise reach the driver's eyes