Awave hits the beach every 10 seconds whats its frequency?
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a 0.10 hz
b 1.0 hz
c 10.0 hz
d 100.0 hz

The frequency of the wave is 0.10 Hz

Explanation:

Number of vibrations or number of waves per unit time is called frequency. The SI unit of frequency is Hz. It is given by the equation  

In this question time = 10 seconds

number of waves = 1

Frequency is a characteristic feature of waves. Other characteristics of a wave are time period, amplitude etc. Time period is the time taken for one complete vibration and frequency is obtained by taking the reciprocal of time period.

frequency

work: w = fd (given)

work done by chet   =50*1 = 50 j

work done by mika =40*2 = 80 j

work done by sara =30*1.5 = 45 j

work done by bill =60*0.5 = 30 j

students in order from the greatest amount of work done to the least is mika> chet> sara> bill

hence option (b) is correct.

i believe the answer is a hope it and is correct