Test: Behavior of Progressive Waves
10 Questions MCQ Test Physics Class 11 | Test: Behavior of Progressive Waves
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As a wave propagates; which of the following is not satisfied?
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.
Frequency of revolution of disc = 360 rpm = 360 / 60rps = 60rps
Frequency of emitted sound = 6 × No.of holes
= 6 ×60 = 360Hz.
The speed of transverse waves in a string depends on:
For a string v = √(T/μ)
Speed of the sound in a perfectly rigid rod would be
Since particles in a rigid body do not move and hence, no time is delayed in travelling of sound waves.
Which instrument work on the basis of reflection of sound waves?
Stethoscope works on the basis of reflection of sound waves.
f = v/λ
v = λf
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.
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
These are the properties of radio waves. No possible explanation.
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?
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
The speed of transverse waves on a string depends upon
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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