Saved Waves, Sound, Music, Light, and Color

A light wave which is vibrating in more than one plane is referred to as being ___.

unpolarized

The complementary color of cyan light is ___

red

Three colored spotlights - red, green, and blue - may be turned ON and OFF. A shirt which appears magenta under white light appears red under the spotlights. One can conclusively say that the ___ spotlight(s) is/are turned OFF.

blue

Three colored spotlights - red, green, and blue - may be turned ON and OFF. A shirt which appears magenta under white light appears blue under the spotlights. From this information, one cannot conclusively say that the ___ spotlight(s) is/are turned ON or OFF.

green

Three colored spotlights - red, green, and blue - may be turned ON and OFF. A shirt which appears yellow under white light appears green under the spotlights. One can conclusively say that the ___ spotlight(s) is/are turned OFF.

red

Ben is wearing a cyan shirt. Jerry views it through a red filter. Jerry sees Ben's shirt as ___.

black

A primary pigment is unique in that it is a pigment capable of ___.

absorbing a single primary color of light

A sound wave is a ___ wave.

longitudinal

In a sci-fi film, an explosion occurs on spaceship A. After seeing the blast from a long distance away, the occupants of spaceship B hear the loud boom. This is an example of ___.

Rubbish since sound cannot travel through the vacuum of space.

High-pitched sounds are characterized by sound waves which have a ___. List all that apply.

high frequency

If sound A is 100 times as intense as sound B, then sound A ___ sound B.

none of these

Sound A has a decibel level of 30 dB. Sound B is 1000 times more intense than A. Sound B is ___ dB.

60

The decibel scale gives an indication of the sound's ___.

none of these (loudness)

The Doppler shift involves a shift in the ___. List all that apply.

the perceived pitch of a sound observed by a listener

A source of sound produces sound waves with a frequency f. As the source of sound approaches an observer, the ___.

observer perceives sound with a frequency greater than f

The Doppler Effect is observed ___.

of both sound waves and light waves

The Doppler Shift can be observed when ___. List all that apply.

the source of sound moves towards an observer
the observer moves towards the source
the source moves away from an observer
the observer moves away from the source
(Just not: both the observer and the source move at the same speed in the same direction)

A guitar string has a set of natural frequencies at which it wants to vibrate. Which would be a set of typical natural frequencies for a guitar string?

200 Hz, 400 Hz, 600 Hz, 800 Hz
1 Hz, 2 Hz, 3 Hz, 4 Hz, 5 Hz

The fundamental frequency of a guitar string is ___.

the lowest possible frequency at which a guitar string would resonate

Resonance occurs when ___.

an object vibrates at its natural frequency
one vibrating object forces another object to vibrate at its natural frequency

The result of resonance is ___.

a broken instrument
an amplified vibration or loud sound
that bridges fall and dogs die
a noisy or clangy sound

A wave which is travelling fast can be said to have a high ___.

speed

Amplitude

the "height" of the wave, and it's directly related to the wave's energy.

Wavelength (λ)

distance between corresponding points of two consecutive waves.

Which of the following would affect the speed of a water wave? List all that apply.

depth of the water (properties of the medium)

period (T)

the time it takes for the wave to complete one full oscillation, from a crest to a trough and back to the original crest.

speed of a wave (v)

the distance it travels in a given amount of time

wave ends

Fixed end = wave reflects with a flip (inversion)
Free end = wave reflects without a flip

Constructive interference would occur when a ___. List all that apply.

When the crests line up → 🎶 Big, beautiful crest!
When the troughs line up → 🌊 Deep, dramatic trough!