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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.

A

False

20
Q

True or False

Only slinky waves go through destructive interference.

A

False

21
Q

True or False

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

A

False

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.

A

False

23
Q

A pulse in a spring transmits…

A

Energy

24
Q

The maximum distance that the crest of a wave rises above its rest position us known as the waves…

A

Amplitude

25
Q

What generally occurs when a pulse reaches a boundary between two different media?

A

Part of the pulse will transmit and part will reflect

26
Q

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?

A

Increase the tension of the spring

27
Q

Where do you find nodes?

A

Where this is destructive interference

28
Q

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?

A

Increases.

Directly related

29
Q

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?

A

Increases

Directly related

30
Q

By how much must the distances tracked by each wave front differ when they hit a point on a nodal line?

A

A whole number of wavelengths plus 1/2 wavelength

31
Q

How much must the distances traveled by each wave front differ when they hit a point on an anti-node line?

A

A while number of wavelengths

32
Q

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.

A

In the first case you would produce a longitudinal wave, then in the second case you’d be producing a transversal wave.

33
Q

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?

A

The wavelength decreases as the frequency increases so you’re technically changing the wavelength and velocity.

34
Q

How does a single point on the string move as a transverse wave passes by that point?

A

It moves in a perpendicular motion, so up and down.

35
Q

How far does the waves travel in one period?

A

One wavelength

36
Q

What is the resultant displacement in a position where destructive in offense is complete?

A

At zero, because if the energy from the waves are similar, then they cancel out

37
Q

Went to his interfere, can the resultant would be larger than either of the two original waves? If so, under what conditions?

A

If there is constructive interference because the 2 amplitudes would be added together because there is an increase in energy.

38
Q

What is the only thing that determines wave speed

A

A change in medium

39
Q

What is the top part of a transversal wave

A

Crest

40
Q

What is the bottom part of a transversal wave

A

Trough

41
Q

What is energy change about the wave?

A

Amplitude

42
Q

As frequency increases…

A

Wavelength decreases

43
Q

Do you pulses bounce off each other?

A

No, they passed through each other

44
Q

What happens when the pulse it’s a fixed end?

A

It bounces back upside down, or out of phase, and crest becomes trough

45
Q

What happens when a pulse it’s a free end?

A

It bounces back right side up, in phase, and crests stay crests

46
Q

What happens when I post goes from one medium to another

A

Refraction

Partial transmission, partial reflection, severity depends on the difference in mediums, energy of the wave get split up

47
Q

What is light to heavy density like

A

Hitting a fixed end

48
Q

If wavelength changes…

A

Velocity changes

Physics Semester 2 (6 decks)

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