Chapter 29, Problem 16PE

### College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000

Chapter
Section

### College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000
Textbook Problem

# A laser with a power output of 2.00 mW at a wavelength of 400 nm is projected onto calcium metal. (a) How many electrons per second are ejected? (b) What power is carried away by the electrons, given that the binding energy is 2.71 eV?

To determine

(a)

The number of electrons ejected per second.

Explanation

Given:

Wavelength of radiation =Î»=400Â nmÂ =Â 400Ã—10âˆ’9Â m

Number of photons per sec = number of electrons ejected per sec =n

Power of the laser =P=2Â mWÂ =Â 2Â Ã—10âˆ’3Â W

Plank's constant =h=6.63Ã—10âˆ’34Â Js

Speed of photon =c=3Ã—108Â ms

Formula Used:

Power of laser is given as

â€ƒâ€ƒP=nhcÎ»

Calculation:

Power of laser is given as

(b)

To determine

Power carried away by the electrons.

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