Homework Help: ap chem

Posted by lily on Saturday, October 13, 2007 at 3:53pm.

How do you set this problem up?

A laser emits at a wavelength 987 nm. all of its output energy is absorbed in a detector that measures a total energy of .52 joules over a period of 52 seconds. how many photons per second are being emitted by the laser?

ap chem - DrBob222, Saturday, October 13, 2007 at 10:59pm
E= (hc)/lambda.
You know h, c, and lambda (987 x 10^-9 m), so E will be the energy in joules per photon. Use that to calculate # photons per second.

Answer this Question

Related Questions

Physics - A helium-neon laser emits light of wavelength 633 nanometers(nm). ...
chem 115 - The first ionization energy is the energy necessary to completely ...
chem - A laser pulse with wavelength 540 nm contains 4.40 Mj of energy. How many...
chemistry - An argon ion laser puts 5 W of continuous power at a wavelength of ...
Physics - GIVEN: A monochromatic laser is exciting hydrogen atoms from the n=2 ...
Physics Question - Pulsed lasers used in science and medicine produce very short...
AP Chemistry - A mixture of argon and mercury vapor used in advertising signs ...
chemistry - How do you do this problem, I want to know how to set it up for a ...
Science ENGR - Consider a laser which emits photons with a wavelength of 1.55 ...
Physics - A laser used to weld detached retinas emits light with a wavelength of...

For Further Reading

First Name:
School Subject:
Answer: