Ten questions. The result tells you which lessons you may skip.
An upright pulse \(4\,\text{mm}\) high and an upright pulse \(3\,\text{mm}\) high travel towards each other on a string. At the instant their peaks coincide, the displacement there is
At one point of a string, the first wave alone would give \(-3\,\text{mm}\) and the second alone \(+1\,\text{mm}\). The displacement of the string there is
Two pulses of different shapes cross on a string. After they separate,
Two sources give a stable interference pattern only if their waves have
Two coherent waves that start in phase reach a point with a path difference of \(3\lambda/2\). At that point the interference is
Two harmonic waves of amplitude \(A\) travel the same way on a string with a phase difference of \(2\pi/3\). The amplitude of the resultant is
The new disturbance created at a boundary obeys the wave equation because
A pulse reflects from an end tied firmly to a wall. The reflected pulse is
A pulse \(2\,\text{cm}\) high reaches a free end, a light ring on a smooth rod. The ring rises to
A pulse of amplitude \(6\,\text{mm}\) passes from a string into one of four times its mass density, under the same tension. The reflected pulse is