Two long strings A and B, each having linear mass density `1.2 xx 10 ^-2 kg m^-1`, are stretched by different tensions 4.8 N and 7.5 N respectively and are kept parallel to each other with their left ends at x = 0. Wave pulses are produced on the strings at the left ends at t = 0 on string A and at t = 20 ms on string B. When and where will the pulse on B overtake that on A ?

Answer

A, B