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Question

Energy for 6.43 * 10 ^15 photos of 4.27 * 10^14 second -1 frequency in Einstein unit is 

A)1.20 * 10^ -8  

B) 2.58 * 10 ^ -3 

C) 1.06 * 10^ -8

D) 8.33 * 10^ 7


Solution

1mole =6.022*10^23 photons
? mole=6.43*10^15 photons

upon cross multiplying
6.43*10^15photons*1mole/6.022*10^23 photons 
=1.068 *10^-8 mole.

An einstein is a unit defined as the energy in one mole (6.022×1023) of photons.

1 einstein=1mole
? eistein = 1.068*10^-8 moles

cross multiplying 

1.068*10^-8 einstein is the answer

option C is the answer

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