In each of the following situations, a wave passes through an opening in an abso

Question

In each of the following situations, a wave passes through an opening in an absorbing wall. Rank the situations in order from the one in which the wave is best described by the ray approximation to the one in which the wave coming through the opening spreads out most nearly equally in all directions in the hemisphere beyond the wall.

(a) The sound of a low whistle at 1 kHz passes through a doorway 1 m wide.

(b) Red light passes through the pupil of your eye.

(c) Blue light passes through the pupil of your eye.

(d) The wave broadcast by an AM radio station passes through a doorway 1 m wide. (e) An x-ray passes through the space between bones in your elbow joint.

Explanation / Answer

Answer is: e c b a d

Becars the smaller the ratio of wavelength and distance travelled by the wave gives good wave approximation.

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