2.48 In astronomical observations, signals observed from the distant stars are generally weak. If the photon detector receives a total of from the radiations of 600 nm, calculate the number of photons received by the detector.
Let the number of photons received by the detector be .
Then, the total energy it receives from the radiation of will be:
Or
Where,
,
,
and
Substituting the values in the equation above, we get
number of photons is received by the detector.