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?

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:


E=hv (1)


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:


λ=cv (2)


where:

c = speed of light (3.0 × 108 m/s)


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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?

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Photoelectric Effect concept. You can view video lessons to learn Photoelectric Effect. Or if you need more Photoelectric Effect practice, you can also practice Photoelectric Effect practice problems.

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