MHT CET 2020 19th October Evening Shift | Waves Question 94 | Physics

A uniform metal wire has length $L$, mass $M$ and density $\rho$. It is under tension $T$ and $v$ is the speed of transverse wave along the wire. The area of cross-section of the wire is

$\frac{T}{v^2 \rho}$

$\frac{v^2 \rho}{T}$

$T^2 \rho V$

$T v^2 \rho$

MHT CET 2020 19th October Evening Shift

MCQ (Single Correct Answer)

-0

The fundamental frequency of a closed pipe is 400 Hz . If $\frac{1}{3}$ rd pipe is filled with water, then the frequency of 2nd harmonic of the pipe will be (neglect and correction)

1200 Hz

1800 Hz

600 Hz

300 Hz

MHT CET 2020 16th October Evening Shift

MCQ (Single Correct Answer)

-0

A sonometer wire under suitable tension having specific gravity $$\rho$$, vibrates with frequency $$n$$ in air. If the load is completely immersed in water the frequency of vibration of wire will become

$$\left[\frac{\rho-1}{n \rho}\right]^{\frac{1}{2}}$$

$$n\left[\frac{\rho-1}{\rho}\right]^{\frac{1}{2}}$$

$$n\left[\frac{\rho}{\rho-1}\right]^{\frac{1}{2}}$$

$$\left[\frac{n \rho}{\rho-1}\right]^{\frac{1}{2}}$$

MHT CET 2020 16th October Evening Shift

MCQ (Single Correct Answer)

-0

An obstacle is moving towards the source with velocity $$v$$. The sound is reflected from the obstacle. If $$c$$ is the speed of sound and $$\lambda$$ is the wavelength, then the wavelength of the reflected wave $$\lambda_r$$ is

$$\lambda_r=\left(\frac{c-v}{c+v}\right) \lambda$$

$$\lambda_r=\left(\frac{c+v}{c-v}\right) \lambda$$

$$\lambda_r=\left(\frac{c-v}{c}\right) \lambda$$

$$\lambda_r=\left(\frac{c+v}{c}\right) \lambda$$

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