# Problem: If electrons are ejected from a given metal when irradiated with a 11-W red laser pointer, what will happen when the same metal is irradiated with a 5-W green laser pointer?

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###### FREE Expert Solution

We’re being asked to determine what will happen if the same metal is irradiated with a 5W green laser pointer.

We need to determine the number of photons emitted by the 11-W red laser pointer and compare the number of photons emitted by the 5-W green laser pointer

Recall that the energy of a photon (E) is given by:

where:

h = Planck’s constant (6.626 × 10–34 J • s)

v = frequency (in s–1)

Also, recall that the frequency (v) and wavelength (λ) are related:

where:

c = speed of light (3.0 × 108 m/s) ###### Problem Details

If electrons are ejected from a given metal when irradiated with a 11-W red laser pointer, what will happen when the same metal is irradiated with a 5-W green laser pointer?