**1.**

Frequency, f = 1/T

1. A wave with a period of 0.008 second has a frequency of

A. 80 Hz.

B. 12.5 Hz.

C. 800 Hz.

D. 125 Hz.

2. If a wave hits a smooth surface at an angle of incidence of 40 degrees, the angle of reflection is

A. 90 degrees.

B. 80 degrees.

C. 0 degrees.

D. 40 degrees.

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