Which of the following devices is not a transducer?

The audio signal used to modulate $60 \sin(2\pi \times 10^6 t)$ is $15 \sin(300\pi t)$. The depth of modulation is.......$\%$

$A$ sinusoidal wave $y(t) = 40 \sin(10 \times 10^6 \pi t)$ is amplitude modulated by another sinusoidal wave $x(t) = 20 \sin(1000 \pi t)$. The amplitude of the minimum frequency component of the modulated signal is ...........

Sound waves cannot be transmitted directly after conversion into electrical waves because...

Which of the following modulated signals has the best noise tolerance?

For efficient transmission of sound waves of wavelength $\lambda$,the minimum length of the antenna should be.....