The amplitudes of two waves are in the ratio $5 : 2$. If all other conditions for the two waves are the same,what is the ratio of their energy densities?

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

If the amplitude of sound is doubled and the frequency is reduced to one-fourth,the intensity of sound at the same point will be

If the distance between the source and the screen is increased by $2\%$,what will be the effect on the intensity on the screen?

The figure shows a snapshot of a travelling sine wave along a string. Four elemental portions $a, b, c,$ and $d$ are indicated on the string. Which elemental portion$(s)$ has/have the maximum potential energy?