1
MHT CET 2023 12th May Evening Shift
+1
-0

A tuning fork gives 3 beats with $$50 \mathrm{~cm}$$ length of sonometer wire. If the length of the wire is shortened by $$1 \mathrm{~cm}$$, the number of beats is still the same. The frequency of the fork is

A
256 Hz
B
288 Hz
C
297 Hz
D
320 Hz
2
MHT CET 2023 12th May Evening Shift
+1
-0

A tuning fork of frequency $$220 \mathrm{~Hz}$$ produces sound waves of wavelength $$1.5 \mathrm{~m}$$ in air at N.T.P. The increase in wavelength when the temperature of air is $$27^{\circ} \mathrm{C}$$ is nearly $$\left(\sqrt{\frac{300}{273}}=1.05\right)$$

A
0.06 m
B
0.10 m
C
0.09 m
D
0.07 m
3
MHT CET 2023 12th May Morning Shift
+1
-0

A uniform string is vibrating with a fundamental frequency '$$n$$'. If radius and length of string both are doubled keeping tension constant then the new frequency of vibration is

A
$$2 \mathrm{n}$$
B
$$3 \mathrm{n}$$
C
$$\frac{\mathrm{n}}{4}$$
D
$$\frac{\mathrm{n}}{3}$$
4
MHT CET 2023 12th May Morning Shift
+1
-0

The displacement of two sinusoidal waves is given by the equation

\begin{aligned} & \mathrm{y}_1=8 \sin (20 \mathrm{x}-30 \mathrm{t}) \\ & \mathrm{y}_2=8 \sin (25 \mathrm{x}-40 \mathrm{t}) \end{aligned}

then the phase difference between the waves after time $$t=2 \mathrm{~s}$$ and distance $$x=5 \mathrm{~cm}$$ will be

A
B
C
D