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