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# Test: Behavior of Progressive Waves

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Test: Behavior of Progressive Waves - Question 1

### As a wave propagates; which of the following is not satisfied?

Test: Behavior of Progressive Waves - Question 2

### The disc of a siren containing 60 holes rotates at a constant speed of 360 rpm. The emitted sound is in unison with a tuning fork of frequency.

Detailed Solution for Test: Behavior of Progressive Waves - Question 2

Frequency of revolution of disc = 360 rpm = 360 / 60rps = 60rps
Frequency of emitted sound = 6 × No.of holes
= 6 ×60 = 360Hz.

Test: Behavior of Progressive Waves - Question 3

### The speed of transverse waves in a string depends on:

Detailed Solution for Test: Behavior of Progressive Waves - Question 3

For a string v = √(T/μ)

Test: Behavior of Progressive Waves - Question 4

Speed of the sound in a perfectly rigid rod would be

Detailed Solution for Test: Behavior of Progressive Waves - Question 4

Since particles in a rigid body do not move and hence, no time is delayed in travelling of sound waves.

Test: Behavior of Progressive Waves - Question 5

Which instrument work on the basis of reflection of sound waves?

Detailed Solution for Test: Behavior of Progressive Waves - Question 5

Stethoscope works on the basis of reflection of sound waves.

Test: Behavior of Progressive Waves - Question 6

Speed of a progressive wave,v is given by

Detailed Solution for Test: Behavior of Progressive Waves - Question 6

f = v/λ
v = λf

Test: Behavior of Progressive Waves - Question 7

What causes the rolling sound of thunder?

Detailed Solution for Test: Behavior of Progressive Waves - Question 7

The air is not of uniform density as we go upwards. as we go upwards there is a gradual decrease in air density which results in refraction thereby leading to the rolling sound of thunder.

Test: Behavior of Progressive Waves - Question 8

Properties of a kind of wave are given below. Identify the type of wave

i. Wave can not be detected by human ear
ii. Velocity of wave in free space is 3x108m/s
iii. Velocity is not effected by temperature
iv. Waves can travel through vacuum

Detailed Solution for Test: Behavior of Progressive Waves - Question 8

These are the properties of radio waves. No possible explanation.

Test: Behavior of Progressive Waves - Question 9

Y (x,t) =  Syntax error from line 1 column 49 to line 1 column 73. Unexpected ‘mathsize’. represents a moving pulse where X and y are n metres and t in second. Then which of the following dose not hold true?

Detailed Solution for Test: Behavior of Progressive Waves - Question 9

t = 0 & x = 0
y = 0.16 m
ymax = 0.16 m
Pulse is symmetric because y (x) = y (-x)
t = 1s
x=-1.25m
y is again 0.16m
Therefore speed is 1.25m/s
So it travels 2.5 m in 2 sec

Test: Behavior of Progressive Waves - Question 10

The speed of transverse waves on a string depends upon

Detailed Solution for Test: Behavior of Progressive Waves - Question 10

The speed of a wave on a string depends on the square root of the tension divided by the mass per length, the linear density.

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