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Physics > Waves > Flashcards

Waves Flashcards

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1
Q

What does wave transfer?

A

Energy

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2
Q

What do waves do not transfer?

A

Matter

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3
Q

What are the waves that require material medium?

A

Mechanical waves

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4
Q

What are the waves that don’t require medium?

A

Electromagnetic waves

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5
Q

How do electromagnetic waves propagate?

A

Using electric and magnetic fields

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6
Q

What waves travel perpendicular to the direction of propagation of waves?

A

Transverse waves

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7
Q

Which waves consist of crest and trough?

A

Transverse waves

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8
Q

What waves travel in the direction of propagation of waves?

A

Longitudinal waves

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9
Q

What waves consist of rarefactions and compressions?

A

Longitudinal waves

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10
Q

What is the formula for wave speed?

A

v = √TL/M

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11
Q

Is speed in a thick string greater or thin string?

A

Thin string

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12
Q

Theoretically speed of sound is?

A

281 m/s

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13
Q

Experimental value of speed of sound is?

A

332 m/s

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14
Q

What did Laplace corrected?

A

Temperature doesn’t remain constant during compressions and rarefactions.

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15
Q

Range of frequencies dolphin hear?

A

150-150,000

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16
Q

Range of frequencies bat hear?

A

1000-20,000

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17
Q

Range of frequencies cat hear?

A

60-70,000

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18
Q

Range of frequencies dog hear?

A

15-50,000

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19
Q

Speed of sound depends upon?

A

v = ôRT/m

20
Q

Speed of sound with the wind?

A

Increases

21
Q

Speed of sound against the wind?

A

Decreases

22
Q

Resultant of simultaneous waves acting upon the same point is known as?

A

Principle of Superposition

23
Q

What is interference?

A

Two waves traveling in the same direction with same speed

24
Q

What does slightly different frequencies of waves produce?

A

Beats

25
Q

Two in phase waves meet to form?

A

Constructive interference

26
Q

Two out of phase waves meet to form?

A

Destructive interference

27
Q

What are the sources called for having phase difference constant?

A

Coherent

28
Q

For constructive interference the path difference between the waves must be?

A

Zero or integral multiple of wavelength

29
Q

For destructive interference the path difference is?

A

Odd integral multiple of wavelength/2

30
Q

The point of zero displacement on stationary waves?

A

Nodes

31
Q

The point of max. Amplitude on stationary waves?

A

Antinodes

32
Q

Points between two successive nodes are?

A

In phase with each other

33
Q

The distance between two consecutive nodes?

A

Wavelength/2

34
Q

Frequency of first mode of vibration?

A

f1 = (√TL/M)/2L

35
Q

Frequency of second mode of vibration?

A

f2 = 2(v/2L)

36
Q

What are overtones?

A

Harmonics, integral multiple of fundamental frequency

37
Q

What is Doppler effect?

A

The apparent change in frequencies of sound waves due to relative motion of the source or listener

38
Q

If the frequencies of waves increases the object is moving?

A

Towards you

39
Q

If the frequencies is decreasing, the object is moving?

A

Away from you

40
Q

What is blue shift?

A

A star is moving closer to the surface of earth

41
Q

What is red shift?

A

A star is moving away from the earth

42
Q

Formula for source moving towards the listener?

A

f’ = (v/v - a)f

43
Q

Formula for source moving away from the listener?

A

f’ = (v/v+a)f

44
Q

Formula for listener to move towards the stationary sound source?

A

f’ = (v+b/v)f

45
Q

Formula for listener moving away from the stationary sound source?

A

f’ = (v/v+b)f

46
Q
A

Mono atomic 1.67
Di atomic 1.40
Poly atomic 1.29

Physics (4 decks)

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