Section 1
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Very long wavelength water waves:
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Last updated
6 years ago
Date created
Mar 1, 2020
Cards (63)
Section 1
(50 cards)
Very long wavelength water waves:
travel faster than short ones
A Richter magnitude 9 earthquake compared to a Richter 8 earthquake
has 10 to 30 times the energy
The piano note A above middle C is 440 Hz. The next higher A has a frequency
880 Hz
The ozone layer is created by
sunlight
An "octave" refers to two frequencies which differ by a factor of
2
Fluorescent lights flicker on and off at what rate
120 Hz
The fastest sound wave is
they all travel at the same speed
GPS works by:
receiving signals and calculating the position
Thunderclouds tend to rise until
they reach air that is warmer than they are
Beats measure
the difference between two frequencies
Water waves are
both transverse and longitudinal
If we double the frequency of sound, the wavelength is
halved
Waves tend to bend in the direction that
wave velocity is slower
The velocity of sound is approximately
1000 feet per second
Which animal uses ultrasonic echolocation to hunt and avoid obstacles?
bats
The speed of sound in air
increases as air temperature increases
The mirage of water on a road comes from
light bending upward
A pianist plays two keys: middle C, the C above middle C (i.e. an octave higher). The speed of sound for the higher frequency, compared to that for the lower frequency is
the same
The sound channel in the ocean carries sound over a long distance because
the sound doesn't spread out in the up or down directions
SOSUS refers to
a system for detecting submarines
During a typical day, sound emitted near the ground tends to bend:
upwards, toward the sky
You hear three beats per second when two sound tones are generated. The frequency of one tone is known to be 610 Hz. The frequency of the other is
607 or 613 Hz
As you move to a higher altitude, the temperature of the air
first gets cooler, then warmer
Which animal uses infrasound to communicate over long distances?
elephants
In a Shepard Scale, the sound
tricks you into thinking the pitch is gradually getting lower
Landfill is dangerous because
the amplitude of the earthquake increases
As you travel deeper into the ocean, the water temperature T
decreases with depth
Because of evaporation, the air above the surface of a lake becomes cool. Sound in the air above the lake will tend to:
Bend downwards toward the surface
Beats demonstrate
sound is a wave
SOFAR took advantage of
the sound channel in the ocean
Which of the following was true about Project Mogul?
it was concerned with the atmosphere
The ocean sound channel
is very quiet
An earthquake wave does its worst damage when it reaches an area that
slows it down
The L wave is often the most damaging because
It stays on the surface, so it doesn't spread out very much
To have a sound channel there must be
an increase of the velocity with depth
When there is an atmospheric "inversion," then sound tends to
bend downwards
The same note is heard on two pianos. Beats are heard once per second. From this we can deduce:
at least one of the pianos is out of tune (the notes are at the wrong frequency)
According to the text, the "Flying Disks" that crashed near Roswell were
microphones
The fastest earthquake wave is the
P wave
Sound travels fastest in
rock
Which kind of earthquake wave is purely longitudinal?
P wave
The Global Positioning System (GPS) works when you receive radio waves from at least
3 satellites
A water wave has a wavelength of 10 meters, and a frequency of 2 cycles/sec. Its velocity is
20 meters per second
The atmospheric sound channel would not exist, if not for
ultraviolet light
You are more likely to hear distant sounds when
the air near the ground is cool and the air above it is warm
Which of the following statements about earthquakes is true?
P waves are fastest and L waves cause the most destruction
When an earthquake at sea starts a tsunami or tidal wave, the initial height is relatively small. What accounts for the towering wave that breaks near the shore?
the waves move slower
What is common among SOFAR, GPS, and SOSUS
all systems use triangulation to find an unknown position on earth
There are some points on a standing wave that never move. What are these points called?
nodes
A spectrogram
A visual representation of sound frequencies
Section 2
(13 cards)