MHT CET 2024 2nd May Evening Shift | Waves Question 111 | Physics

The driver of a car travelling with a speed ' $V_1$ ' $\mathrm{m} / \mathrm{s}$ towards a wall sounds a siren of frequency ' $n$ ' Hz. If the velocity of sound in air is ' V ' $\mathrm{m} / \mathrm{s}$, then the frequency of the sound reflected from the wall and as heard by the driver in Hz is

$\left(\frac{V_1}{V-V_1}\right) n$

$\left(\frac{V_1-V}{V+V_1}\right) n$

$\left(\frac{V+V_1}{V-V_1}\right) n$

$\left(\frac{V-V_1}{V+V_1}\right) n$

MHT CET 2024 2nd May Evening Shift

MCQ (Single Correct Answer)

-0

A stretched string is fixed at both ends. It is made to vibrate so that the total number of nodes formed in it is ' $x$ '. The length of the string in terms of the wavelength of waves formed in it is ( $\lambda=$ wavelength $)$

$\frac{\mathrm{X} \lambda}{2}$

$\left(\mathrm{X}+\frac{1}{2}\right) \frac{\lambda}{2}$

$(\mathrm{X}+1) \frac{\lambda}{2}$

$(\mathrm{X}-1) \frac{\lambda}{2}$

MHT CET 2024 2nd May Evening Shift

MCQ (Single Correct Answer)

-0

A sonometer wire is stretched by hanging a metal bob. The fundamental frequency of vibration of wire is ' $n_1$ '. When the bob is completely immersed in water, the frequency of vibration of wire becomes ' $n_2$ '. The relative density of the metal of the bob is

$\frac{\mathrm{n}_1}{\mathrm{n}_1-\mathrm{n}_2}$

$\frac{\mathrm{H}_2}{\mathrm{n}_1-\mathrm{n}_2}$

$\mathrm{\frac{n_1^2}{n_1^2-n_2^2}}$

$\frac{\mathrm{n}_2^2}{\mathrm{n}_1^2-\mathrm{n}_2^2}$

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