Speed of sound is more if density of medium is less. Sound travels faster in water than in air though the density of air is less. Why?

One can hear people talking in next room but can’t see them. Why?

What is diffraction of sound?

How does an ear trumpet help to hear clearly? Note: (Conditions) 1) Like Our Page on Facebook 2) Share this Question on Facebook (Winner will be provided Rs 50 NTC/NCELL recharge card)

A progressive wave has frequency of 40 Hz and velocity 50 m/s. Find the phase difference between two points on the wave at a separation of 40 cm.

What is standing wave?

State superposition principle of wave.

The equation of a wave is given by Y = 0.3 sin (2t – 0.5x) Where Y is in cm and t is in seconds. Find the wavelength, frequency and amplitude of the wave.

Uranium nucleus has more binding energy than Iron nucleus but Uranium nucleus is less stable than Iron nucleus. Why?