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Physics Semester 2 > Physical Waves > Flashcards

Physical Waves Flashcards

0
Q

If an incident wave makes a 20 degree angle with the WALL from which it bounces, the reflected wave will make what angle with the normal line?

10, 20, 45 or 70

A

70

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1
Q

When a wave meets a boundary between two media of differing densities, which properties will change? What won’t?

A

The direction and wavelength will change, but the frequency will stay the same.

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2
Q

To say the one wave is out of phase with another is to say that…

A

The waves are out of step (not synchronized

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3
Q

As the frequency of a wave generated by a radio transmitter is increased, the wavelength…

A

Decrease

Inversely related

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4
Q

What is the velocity equation?

A

Velocity=frequency(wavelength)

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5
Q

How can you tell which waves have the greatest energy?

A

By the amplitude compared to the wavelength

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6
Q

If I add energy to a wave, I will change the waves….

A

Amplitude

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7
Q

Denser medium characteristics

A
  • shorter wavelength
  • slower
  • shallow
  • smaller angle
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8
Q

Less dense medium characteristics

A
  • longer wavelength
  • faster velocity
  • larger angle
  • deep
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9
Q

What is diffraction?

A

The bending of waves through an opening

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10
Q

What is reflection?

A

The bouncing of waves off a barrier

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11
Q

If a wave enters a shallower medium what happens to it

A

It refracts to a smaller angle and it’s slower and shorter wavelengths

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12
Q

A student in front of a big wall claps hands at a rate of 2 claps per second. The students hears the echo of the first clap just as she makes the second clap. Assuming that the speed of sound is 343 m/s, what is the distance to the wall?

A

86m

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13
Q

True or False

Transverse waves vibrate perpendicular to their direction of travel.

A

True

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14
Q

True or False

Longitudinal waves are the same as compressional waves.

A

True

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15
Q

True or False

A wave speed depends on the shape of the wave.

A

false

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16
Q

True or False

Complete transmission occurs when waves go from one medium to another.

A

False

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17
Q

True or False

The speed of a wave does not depend on the size of the pulse.

A

True

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18
Q

True or False

Reflected waves travel at slower speeds than the incident wave in the same medium.

A

False

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19
Q

True or False

A wave pulse is inverted in free end reflection.

20
Q

True or False

Only slinky waves go through destructive interference.

21
Q

True or False

A wave pulse bounces off another wave pulse in wave interference.

22
Q

True or False

When a wave goes from a less dense to a more dense medium, the reflected pulse will be in phase.

23
Q

A pulse in a spring transmits…

24
The maximum distance that the crest of a wave rises above its rest position us known as the waves...
Amplitude
25
What generally occurs when a pulse reaches a boundary between two different media?
Part of the pulse will transmit and part will reflect
26
A single pulse propagates along a coil spring. What has to be done to decrease the time interval it takes for the pulse to travel 10 meters?
Increase the tension of the spring
27
Where do you find nodes?
Where this is destructive interference
28
For two point sources with overlapping waves, what happens to the number of places of constructive interference if the frequency of the wave increases with the source separation constant?
Increases. Directly related
29
For two point sources with overlapping waves, what happens to the number of places of destructive interference as the separation between the sources increases while the frequency stays constant?
Increases Directly related
30
By how much must the distances tracked by each wave front differ when they hit a point on a nodal line?
A whole number of wavelengths plus 1/2 wavelength
31
How much must the distances traveled by each wave front differ when they hit a point on an anti-node line?
A while number of wavelengths
32
Suppose you hold a metal bar in your hand and hit it with a hammer, first in a direction parallel to its length and then in a direction at right angles to its length. Describe the waves you would produce in both cases.
In the first case you would produce a longitudinal wave, then in the second case you'd be producing a transversal wave.
33
Suppose you repeatedly dip your finger into a sink full of water to make circular waves. What happens to the wavelength as you move your finger faster? By moving your finger faster what are you changing?
The wavelength decreases as the frequency increases so you're technically changing the wavelength and velocity.
34
How does a single point on the string move as a transverse wave passes by that point?
It moves in a perpendicular motion, so up and down.
35
How far does the waves travel in one period?
One wavelength
36
What is the resultant displacement in a position where destructive in offense is complete?
At zero, because if the energy from the waves are similar, then they cancel out
37
Went to his interfere, can the resultant would be larger than either of the two original waves? If so, under what conditions?
If there is constructive interference because the 2 amplitudes would be added together because there is an increase in energy.
38
What is the only thing that determines wave speed
A change in medium
39
What is the top part of a transversal wave
Crest
40
What is the bottom part of a transversal wave
Trough
41
What is energy change about the wave?
Amplitude
42
As frequency increases…
Wavelength decreases
43
Do you pulses bounce off each other?
No, they passed through each other
44
What happens when the pulse it's a fixed end?
It bounces back upside down, or out of phase, and crest becomes trough
45
What happens when a pulse it's a free end?
It bounces back right side up, in phase, and crests stay crests
46
What happens when I post goes from one medium to another
Refraction Partial transmission, partial reflection, severity depends on the difference in mediums, energy of the wave get split up
47
What is light to heavy density like
Hitting a fixed end
48
If wavelength changes...
Velocity changes

Physics Semester 2 (6 decks)

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