MHT CET 2025 22nd April Evening Shift | Waves Question 30 | Physics

The fundamental frequency of a sonometer wire is 50 Hz for some length and tension. If the length is increased by $25 \%$ by keeping tension same then frequency change of second harmonic is

increased by $20 \%$

decreased by $20 \%$

increased by $10 \%$

decreased by $10 \%$

MHT CET 2025 22nd April Evening Shift

MCQ (Single Correct Answer)

-0

When source of sound and observer both are moving towards each other, the observer will hear

low frequency, low wavelength.

low frequency, high wavelength.

high frequency, low wavelength.

high frequency, high wavelength.

MHT CET 2025 22nd April Evening Shift

MCQ (Single Correct Answer)

-0

The lengths of the two organ pipes open at both ends are ' L ' and $\left(\mathrm{L}+\mathrm{L}_1\right)$. If they are sounded together, the beat frequency will be ( $\mathrm{v}=$ velocity of sound in air)

$\frac{2 v L_1}{L\left(L+L_1\right)}$

$\frac{2 \mathrm{~L}\left(\mathrm{~L}+\mathrm{L}_1\right)}{\mathrm{vL}_1}$

$\frac{\mathrm{vL}_1}{\mathrm{~L}\left(\mathrm{~L}+\mathrm{L}_1\right)}$

$\frac{v L_1}{2 L\left(L+L_1\right)}$

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