Problem: An argon ion laser puts out 5.1 W of continuous power at a wavelength of 532 nm. The diameter of the laser beam is 5.8 mm .If the laser is pointed toward a pinhole with a diameter of 1.2 mm, how many photons will travel through the pinhole per second? Assume that the light intensity is equally distributed throughout the entire cross-sectional area of the beam. (1 W = 1 J/s).Hint: Use the formula for the area of a circle (A = πr2) to find the cross-sectional area of the beam and of the pinhole and determine what fraction of the power gets through the pinhole.

FREE Expert Solution
99% (158 ratings)
View Complete Written Solution
Problem Details

An argon ion laser puts out 5.1 W of continuous power at a wavelength of 532 nm. The diameter of the laser beam is 5.8 mm .

If the laser is pointed toward a pinhole with a diameter of 1.2 mm, how many photons will travel through the pinhole per second? Assume that the light intensity is equally distributed throughout the entire cross-sectional area of the beam. (1 W = 1 J/s).

Hint: Use the formula for the area of a circle (A = πr2) to find the cross-sectional area of the beam and of the pinhole and determine what fraction of the power gets through the pinhole.

Frequently Asked Questions

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 Diffraction vs Refraction concept. If you need more Diffraction vs Refraction practice, you can also practice Diffraction vs Refraction practice problems.

What textbook is this problem found in?

Our data indicates that this problem or a close variation was asked in Chemistry: Structure and Properties - Tro 2nd Edition. You can also practice Chemistry: Structure and Properties - Tro 2nd Edition practice problems.