Question

Calculate number of photons emitted by 60 watt bulb in 10 hours.When 6000 Armstrong of light is emitted by it.​

Answer 1

Answer:

The equation is going to be

Energy = Power*Time = n hc/lambda

Plug in all the values given and you will then find out the value of n

Answer 2

Answer:

Watt = Energy/Time = Joule/sec

Total energy = 60×10×3600J

let the no. of photons be Z

then,

60×10×3600J = Z { 12420/6000 } × 1.6 × 10^(-9)

by solving,

21,60,000 = Z { 2.07 } × 1.6 × 10^(-9)

Z = 21,60,000/3.312 × 10^(9)

Z = 6.152 (approx)