Question

Radiation power of 3.31 watt is falling on a surface. It 20% of light is absorbed and Remaining is reflected back calculate number of photons reflected per second.Take the frequently of each photon 10 HZ and h=6.62

Answer 1

Answer: 5×10 power 15

Explanation:V=6.0×10  

4

 

P=2.0×10  

−3

w

No. of photons per sec

=  

energy one photon

power

​

=  

6.63×10  

−34

×6×10  

14

 

1×10  

−3

 

​

 

=5.03×10  

15