Suppose a snowy cricket is chirping when the temperature is 65.0 degrees Fahrenheit

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#1

Suppose a snowy cricket is chirping when the temperature is 65.0 degrees Fahrenheit. How many oscillations does the radiation from a cesium-133 atom complete between successive chirps?
A. 7.98 × 107
B. 3.68 × 108
C. 4.78 × 109
D. 9.58 × 109

Answer:

We have number of chirps in 13s N = T- 40
Here image
Therefore N = 65 - 40
= 25 Chirps in 13s
Then time taken for successive chirps is image
But time taken for radiation from a cesium-133 to complete 9,192,631,770 cycles is 1s.
Therefore number of oscillations in 1s is 9,192,631,770
Then the number of oscillations in 0.867s is
image
image
So, option C. is correct.