With the propagation of a longitudinal wave through a material medium,the quantities transmitted in the propagation direction are

If the ratio of the amplitude of two waves is $4:3$,then the ratio of their maximum and minimum intensity is:

Statement-$1$: Two longitudinal waves given by equations $y_1(x, t) = 2a \sin(\omega t - kx)$ and $y_2(x, t) = a \sin(2\omega t - 2kx)$ will have equal intensity.
Statement-$2$: Intensity of waves of given frequency in the same medium is proportional to the square of amplitude only.

The intensity ratio of two waves is $1 : 16$. The ratio of their amplitudes is

$A$ person speaking normally produces a sound intensity of $40 \ dB$ at a distance of $1 \ m$. If the threshold intensity for reasonable audibility is $20 \ dB$,the maximum distance at which he can be heard clearly is ... $m$.

The ratio of intensities of two waves is given by $4:1$. The ratio of the amplitudes of the two waves is