Physics – Chapter 19 – Flashcards

Unlock all answers in this set

Unlock answers
question
What is a wiggle in time called?
answer
a vibration
question
What do you call a wiggle in space and time?
answer
a wave
question
What is the source of all waves?
answer
something that is vibrating (or a medium)
question
What is meant by the period of a pendulum?
answer
the time for one complete vibration
question
How is a sine related to a wave?
answer
a sine curve is a pictorial representation of a wave produced by a simple harmonic motion
question
Peiod
answer
the time of a to-and-fro swing
question
Amplitude
answer
the distance from the midpoint to the crest (or trough) of the wave
question
Wavelength
answer
-the distance from the top of one crest to the top of the next crest -the distance from the bottom of one trough to the bottom of the next trough -the distance between any successive identical parts of the wave
question
Frequency
answer
the number of to-and-fro vibrations it makes in a given time (usually 1 second) Frequency=1/period
question
How many vibrations per second are represented in a radio wave of 101.7 MHz?
answer
101.1 * 1,000,000 (MHz) = 101,700,000
question
How do frequency and period relate to each other?
answer
-the frequency and period are the inverse of each other Frequency = 1/Period Period = 1/Frequency
question
In one work, what is it that moves from source to receiver in wave motion?
answer
energy
question
Does the medium in which a wave travels move with the wave? Give examples to support your answer.
answer
No. If the salt water in an ocean waved moved with the wave, the land would become flooded as the salt water would not stop moving forward. You can also visualize this with a cork floating in the ocean. As the waves move by, the cork seems to stand still in the same position.
question
In what direction are the vibrations relative to direction of wave travel in a transverse wave?
answer
the motion of the medium is transverse (or perpendicular) to the direction the wave travels
question
In what direction are the vibrations relative to the direction of wave travel in a longitudinal wave?
answer
motion is along (or parallel) the direction of the wave
question
The wavelength of a transverse wave is the distance between successive crests (or troughs). What is the wavelength of a longitudinal wave?
answer
the distance between successive compressions or, equivalently, the distance between successive rarefactions
question
What is meant by the superposition principle?
answer
when more than one wave occupies the same space at the same time, the displacements add at every point
question
Distinguish between constructive interference and destructive interference.
answer
constructive-when the crests of one wave overlaps the crest of another, their individual effects add together to produce a wave of increased amplitude destructive-when the crest of one wave overlaps the trough of another, their individual effects are reduced
question
What kinds of waves can show interference?
answer
all waves
question
What is a node?
answer
parts of the wave that appear to standing still
question
What is an antinode?
answer
regions of maximum displacement and maximum energy
question
Are standing waves a property of transverse waves, of longitudinal waves, or of both?
answer
Both
question
In Doppler effect does frequency? Does wavelength change? Does wave speed change?
answer
frequency - yes wavelength - yes wave speed - yes
question
Can the Doppler effect be observed with longitudinal waves, with transverse waves, or with both?
answer
Both
question
What is meant by a blue shift and a red shift for light?
answer
Blue shift = increased frequency of light. Red shift = decreased frequency of light.
question
How fast must a bug swim to keep up with the waves it produces? How fast must it move to produce a low wave?
answer
right along with the leading edge of the waves; faster than wave speed
question
How fast does a supersonic aircraft fly compared with the speed of sound?
answer
the aircraft surpasses the speed of sound
question
How does the V shape of a bow wave depend on the speed of the source?
answer
after the speed of the source exceeds wave speed, increased speed of the source produces a narrower V shape
question
A bow wave on the surface of water is two dimensional. how about a shock wave in air?
answer
3 dimensional
question
True or false. A sonic boom occurs only when an aircraft is breaking through the sound barrier. Defend your answer.
answer
Fasle. A sonic boom occurs when any object breaks the sound barrier
question
True or false. In order for an object to produce a sonic boom, it must be "noisy". Give 2 examples to support your answer.
answer
False. Bullet and lion whip.
Get an explanation on any task
Get unstuck with the help of our AI assistant in seconds
New