1
IAT (IISER) 2023
MCQ (Single Correct Answer)
+4
-1
The frequency of the whistle of a train moving with a constant speed is observed by a stationary detector on the platform to be $v_1$. The frequency of the same whistle is detected to be $v_2$ inside another train moving on a parallel track, at a speed $v$ towards the frst train. If the speed of sound in air is taken to be $v_s$ ound, what is the ratio $v / v_s$ ound?
A
$\frac{v_2-v_1}{v_1}$
B
$\frac{v_2-v_1}{v_2}$
C
$\frac{v_2}{v_1}$
D
$\frac{v_1}{v_2}$
2
IAT (IISER) 2022
MCQ (Single Correct Answer)
+4
-1
A uniform taut string with two point charges $q$ and $-q$ attached to its ends passes over two massless pullies kept $L$ distance apart as shown in the fgure. If $f$ is the fundamental frequency of the part of the string over pullies, which of the following statements is correct? IAT (IISER) 2022 Physics - Waves Question 1 English
A
$f \propto L^{-2}$
B
$f \propto L^{-1}$
C
$f \propto L$
D
$f \propto L^2$
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