Question

One end of a horizontal string is fixed to a wall. A transverse wave pulse is generated at the other end, moves toward the wall as shown and is reflected at the wall. Properties of the reflected pulse include which of the following?

I. It has a greater speed than that of the incident pulse.

II. It has a greater amplitude than that of the incident pulse.

III. It is on the opposite side of the string from the incident pulse.

(A) I only 

(B) III only 

(C) I and II only 

(D) II and III only 

(E) I, II, and III

Answer 1

The correct option is: (B) III only

Explanation:

When hitting a fixed boundary, some of the wave is absorbed, some is reflected inverted. The reflected wave has less amplitude since some of the wave is absorbed, but since the string has not changed its properties the speed of the wave should remain unchanged.