Two wave pulses identical in shape but inverted with respect to each other are produced at the two ends of a stretched string. At an instant when the pulses reach the middle, the string becomes completely straight. What happens to the energy of the two pulses ?

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

Why don't we have interference when two candles are placed close to each other and the intensity is seen at a distant screen? What happens if the candles are replaced by laser sources?

A string of linear mass density 0.5 g cm^-1 and a total length 30 cm is tied to a fixed wall at one end and to a frictionless ring at the other end. The ring can move on a vertical rod. A wave pulse is produced on the string which moves towards the ring at a speed of 20 cm s^-1 . The pulse is symmetric about its maximum which is located at a distance of 20 cm from the end joined to the ring. (a) Assuming that the wave is reflected from the ends without loss of energy, find the time taken by the string to regain its shape. (b) The shape of the string changes periodically with time. Find this time period. (c) What is the tension in the string ?

A wave pulse is travelling on a string with a speed v towards the positive x-axis. The shape of the string at t = 0 is given by y(x) = A sin(x//a) , where A and a are constants. (a) What are the dimensions of A and a ? (b) Write the equation of the wave for a general time t , if the wave speed is v .

A wave pulse is travelling on a string with a speed v towards the positive x-axis. The shape of the string at t = 0 is given by y(x) = A sin(x//a) , where A and a are constants. (a) What are the dimensions of A and a ? (b) Write the equation of the wave for a general time t , if the wave speed is v .

Two waves, each having a frequency of 100 Hz and a wavelength of 2.0 cm, are travelling in the same direction on a string. What is the phase difference between the waves (a) if the second wave was produced 0.015 s later than the first one at the same place, (b) if the two waves were produced at the same instant but the first one was produced a distance 4.0 cm behind the second one ? (c) If each of the waves has an amplitude of 2.0 mm, what would be the amplitudes of the resultant waves in part (a) and (b) ?