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Chapter 38: Q. 37 (page 1115)

A ruby laser emits an intense pulse of light that lasts a mere 10ns. The light has a wavelength of 690nm, and each pulse has an energy of 500mJ.

a. How many photons are emitted in each pulse?

b. What is the rate of photon emission, in photons per second, during the10ns that the laser is “on”?

Short Answer

Expert verified

a. The photons are emitted in each pulse is 1.74×1018.

b. The rate of photon emission, in photons per second, during the10nsis1.74×1026photons.

Step by step solution

01

Part (a) step 1: Given Information

We need to find photons are emitted in each pulse.

02

Part (a) step 2: Simplify

We can start the solution with the total energy of the pulse as:

Enet=NEphEph=hcλN=EnetEphN=EnetλhcN=500×10−3×690×10−96.63×10−34×3×108N=1.74×1018

03

Part (b) step 1: Given Information

We need to find the rate of photon emission, in photons per second, during the10ns.

04

Part (b) step 2: Simplify

Now, use the definition of the rate of emission:

R=NtR=1.74×101810×10-9R=1.74×1026photonss

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Most popular questions from this chapter

In the following Figure is an energy-level diagram for a simple atom. What wavelengths, in nm, appear in the atom’s (a) emission spectrum and (b) absorption spectrum?

In the atom interferometer experiment of Figure 38.13, laser cooling techniques were used to cool a dilute vapor of sodium atoms to a temperature of 0.0010K=1.0mK. The ultracold atoms passed through a series of collimating apertures to form the atomic beam you see circling the figure from the left. The standing light waves were created from a laser beam with a wavelength of 590nm.

a. What is the rms speed vmeof a sodium atom (A-23)in a gas at temperature 1.0mK?

b. By treating the laser beam as if it were a diffraction grating. Calculate the first-order diffraction angle of a sodium atom traveling at the rms speed of part a.

c. how far apart are the points Band Cif the second sanding wave is 10cmfrom the first?

d. Because interference is observed between the two paths, each individual atom is apparently present at both points Band point CDescribe, in your own words, what this experiment tells you about the nature of matter.

A ruby laser emits an intense pulse of light that lasts a mere 10 ns. The light has a wavelength of 690 nm, and each pulse has an energy of 500 mJ. a. How many photons are emitted in each pulse? b. What is the rate of photon emission, in photons per second, during the 10 ns that the laser is “on”?

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a. Explain why the graphs of Figure 38.3 are mostly horizontal for ∆V > 0.

b. Explain why photoelectrons are ejected from the cathode with a range of kinetic energies, rather than all electrons having the same kinetic energy.

c. Explain the reasoning by which we claim that the stopping potential Vstop indicates the maximum kinetic energy of the electrons
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