Adischarge lamp rated at 25 w (1 w = 1 j/s) emits yellow light of wavelength 580 nm. how many photons of yellow light does the lamp generate in 1.0 s?

the number of photons of yellow light does the lamp generate in 1.0 s is 7 x

Explanation:

given information:

power, P = 25 W

wavelength. λ - 580 nm = 5.80 x m

time, t = 1 s

to calculate the number of photon(N), we use the following equation

N = λPt/hc

where

λ = wavelength (m)

P = power (W)

t = time interval (s)

h = Planck's constant (6.23 x Js)

c = light's velocity (3 x )

So,

N = λPt/hc

   = (5.80 x )(25)(1)/(6.23 x )(3 x )

    = 7 x

answer; /// i believe that the correct answer is (c)

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