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Waves NAT Level - 2 - Physics MCQ


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10 Questions MCQ Test Topic wise Tests for IIT JAM Physics - Waves NAT Level - 2

Waves NAT Level - 2 for Physics 2024 is part of Topic wise Tests for IIT JAM Physics preparation. The Waves NAT Level - 2 questions and answers have been prepared according to the Physics exam syllabus.The Waves NAT Level - 2 MCQs are made for Physics 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Waves NAT Level - 2 below.
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*Answer can only contain numeric values
Waves NAT Level - 2 - Question 1

A observer is standing 10 m from a road on which a vehicle is approaching him at a speed of 96 /hr when the vehicle is 50 m away from him, it blows a horn of frequency 8000 Hz what will be the frequency observed by the observer?


Detailed Solution for Waves NAT Level - 2 - Question 1




= 8668 Hz
The correct answer is: 8668

*Answer can only contain numeric values
Waves NAT Level - 2 - Question 2

Consider a pipe 12 cm in length. Find by how much percentage does the fundamental frequency change when the pipe which was originally open at both ends is now closed from one side.


Detailed Solution for Waves NAT Level - 2 - Question 2

Exactly half wavelength fits the pipe, 

When one end is closed then  of a wavelength fits the pipe

= 50%
The correct answer is: 50

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*Answer can only contain numeric values
Waves NAT Level - 2 - Question 3

In extremely, cold places, the temperatures are slow that it effects the speed of sound in air. On a day with temperature -35°C, a source emits sound at a frequency of 1050 Hz & moves away from an observer at 25 m/s, the frequency that the observer measures is 97141 Hz. Find the speed of sound (in m/s).


Detailed Solution for Waves NAT Level - 2 - Question 3



The correct answer is: 309

*Answer can only contain numeric values
Waves NAT Level - 2 - Question 4

An organ pipe, closed at one and open at the other, is designed to have a fundamental frequency of c( 131 Hz) what is the frequency of the next higher harmonic for this pipe?


Detailed Solution for Waves NAT Level - 2 - Question 4

For a pipe of length L, Closed at one and open at the other end, the resonant frequencies are given by
 where n - 1, 3, 5
and v is the speed of the sound
Thus, a fundamental frequency is  and the next harmonic has a frequency  For the next harmonic,
f(n = 3) = 3f(n = 1) = 3 x 131
= 393 Hz
The correct answer is: 393

*Answer can only contain numeric values
Waves NAT Level - 2 - Question 5

At 20°C, a pipe open at both ends resonates at a frequency of 440 Hz. At what frequency does the same pipe resonate on a cold day when the speed of sounds is 3 percent lower than it would be at 20°C


Detailed Solution for Waves NAT Level - 2 - Question 5

*Answer can only contain numeric values
Waves NAT Level - 2 - Question 6

The equation of a wave traveling on a string is  .  If x and y are in cm, then velocity of wave is ________ (in cm/s).


Detailed Solution for Waves NAT Level - 2 - Question 6

Direction positive

The correct answer is: 64

*Answer can only contain numeric values
Waves NAT Level - 2 - Question 7

A distant galaxy is observed to have its hydrogen-β line shifted to a wavelength of 580 nm find the approximate velocity of recession of the distant galaxy in unit of 108 m/s


Detailed Solution for Waves NAT Level - 2 - Question 7

Applying the relativistic doppler effect

The correct answer is: 0.84

*Answer can only contain numeric values
Waves NAT Level - 2 - Question 8

Sound wave moving at 350 m/s difference out of a speaker enclosure with an opening that is a long rectangular slit 0.14m across. At about what frequency will the sound first disappear at an angle of 45° from the normal to the speaker face?


Detailed Solution for Waves NAT Level - 2 - Question 8

The first minimum is determined by

The correct answer is: 3500

*Answer can only contain numeric values
Waves NAT Level - 2 - Question 9

A source is emitting sound with frequency 4371 Hz. Find the magnitude of difference of the two velocities with which the observer must move to observe a frequency that is 20% higher and 20% lower than the actual frequency (in m/s).


Detailed Solution for Waves NAT Level - 2 - Question 9

fs = frequency of source = 4371 Hz

When ovserved frequency is 20% higher

= 68 m/s
When the observed frequency is 20% lower

(-) sign indicates that the observer is moving away from the source?
∴ Difference of velocities = 68 - (-68)
= 136 m/s
The correct answer is: 136

*Answer can only contain numeric values
Waves NAT Level - 2 - Question 10

During a Hurricane, a 1200 Hz warning siren in the town hall sounds the wind is blowing at 55 m/s in a direction from the siren towards a person 1 km away. With what frequency does the sound wave reach the person. The speed of sound in air in 330 m/s. Write in Rounded Figure.


Detailed Solution for Waves NAT Level - 2 - Question 10


f' = Observed Frequency
F= Original frequency.
Apply doppler effect.

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