Two waves travelling in mutually opposite direction in a medium superimpose over each other, then which event is observed -

When plane progressive waves travelling in the same direction superpose over each other then the velocity of resultant wave

Two wave pulses travel in opposite directions on a string and approach each other. The shape of one pulse is inverted with respect to the other

Two wave pulses travel in opposite directions on a string and approach each other. The shape of the one pulse in inverted with respect to the other.

Two identical waves each of frequency 10Hz, are travelling in opposite directions in a medium with a speed of 20 cm/s . Then the distance between adjacent nodes is

Two identical harmonic pulses travelling in opposite directions in a taut string approach each other. At the instant when they completely overlap, the total energy of the string will be .

The two waves of the same frequency moving in opposite direction give rise to

Two wave pulses travel in opposite directions on a string and approch each other. The shape of the one pulse is same with respect to the other

Two sine waves travel in the same direction in a medium. The amplitude of each wave is A and the phase difference between the two waves is 120^@ . The resultant amplitude will be