1
COMEDK 2022
MCQ (Single Correct Answer)
+1
-0

A source of sound emits sound waves at frequency $$f_0$$. It is moving towards an observer with fixed speed $${v_s}$$ ($${v_s},v$$, where $$v$$ is the speed of sound in air.) If the observers were to move towards the source with speed $$v_0$$, one of the following two graphs (A and B) will give the correct variation of the frequency $$f$$ heard by the observer as $$v_0$$ is changed.

The variation of $$f$$ with $$v_0$$ is given correctly by

A
graph A with slope $$= {{{f_0}} \over {(v + {v_s})}}$$
B
graph B with slope $$= {{{f_0}} \over {(v - {v_s})}}$$
C
graph A with slope $$= {{{f_0}} \over {(v - {v_s})}}$$
D
graph B with slope $$= {{{f_0}} \over {(v + {v_s})}}$$
2
COMEDK 2022
MCQ (Single Correct Answer)
+1
-0

The string of length 2 m is fixed at both ends. If the string vibrates in its fourth normal mode with a frequency of 500 Hz, then the waves would travel on it with a velocity of

A
125 m/s
B
250 m/s
C
500 m/s
D
1000 m/s
3
COMEDK 2021
MCQ (Single Correct Answer)
+1
-0

The displacement of a wave is given by

$$y = 20\cos (\omega t + 4z)$$

The amplitude of the given wave is

A
$$10$$
B
$$20$$
C
$$20\sqrt2$$
D
$$10\sqrt2$$
4
COMEDK 2021
MCQ (Single Correct Answer)
+1
-0

If frequencies are $$(\nu-1)$$ and $$(\nu+2)$$, then find the value of beats.

A
2
B
1
C
3
D
4
EXAM MAP
Medical
NEET
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
Civil Services
UPSC Civil Service
Defence
NDA
CBSE
Class 12
© ExamGOAL 2024