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Q. An object moves up and down y-axis with an acceleration given as a function of time t by the expression a = A sin ω t, where A and ω are constants. What is the period of this motion?

Q. Two light sources are used in a photoelectric experiment to decide the work function for a particular metal surface. When green light from the mercury lamp (λ = 546.1 nm) is used, a stopping potential of 0.69 V reduces the photocurrent to zero.

(a) Based on this measurement, what is the work function for this metal?

(b) What stopping potential would be observed while using light from a red lamp (λ = 693.0 nm)?

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Category:- Physics
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