Suppose that during any period of ¼ second there is one instant at which the crests or troughs of component waves are exactly in phase and maximum reinforcement occurs. how many beats will occur in 1 second? a. 4
b. 8
c. 12
d. 2

Answer;

A. 4

Explanation;The period of a wave or periodic time is the time taken for a complete oscillation to occur. For example its is the time taken between two successive crests or troughs.The beats or oscillation that occur in one second represents the frequency. Frequency is the number of complete oscillations or beats in one second in a wave.Frequency, measured in Hertz is given by the reciprocal of the periodic time.Thus; Frequency or beats per second = 1/(1/4) = 4Hence , 4 beats per second

Velocity=total displacement/timefrom house to store is 500 from store to neighbor is 200 therefore total displacement=500+200=700metrestherefore,700metres/910seconds=0.8metres per second