(a) A green laser pointer emits light with a wavelength of
532 nm. What is the frequency of this light? (b) What is the energy of one of these photons? (c) The laser pointer emits light because electrons in the material are excited (by a battery) from their ground state to an upper excited state. When the electrons return to the ground state, they lose the excess energy in the form of 532-nm photons. What is the energy gap between the ground state and excited state in the laser material?
c) The energy gap between ground state and excited state corresponds to the energy of the light emitted. As wavelength of emitted photons is 532 nm, energy gap is:

answer

watching

2,451

views

For unlimited access to Homework Help, a Homework+ subscription is required.

You have 0 free answers left.
Get unlimited access to 3.8 million step-by-step answers.

Get unlimited access

Already have an account? Log in

Irving HeathcoteLv2

14 May 2020

Unlock all answers

Get 1 free homework help answer.

Already have an account? Log in

Join us on Discord

Chemistry Study Group

Join now

Related questions

Which of the following choices properly describes how a laser works?

a) A gain medium (lasing material) is pumped with energy to an excited state with a high-population by means of light or electrical discharge. When the excited state molecule relaxes, a photon is emitted that is can perturb another excited state molecule, causing the emission of a photon with the same energy, phase, and polarization in a process called stimulated emission. The lasing material is placed between two mirrors, one that is highly reflective and one that allows some light to leave. The stimulated emission reflects back and forth between the mirrors causing more stimulated emission, and a small fraction of light is leaked out as the functional laser light.

b) Coherent laser radiation is directly emitted from a gain medium that is pumped by an external energy source (light, electrical). The emitted radiation is passed through a series of filters to produce monochromatic light that is all of the same polarization. The uniformly-polarized light is then sent into a second laser gain medium, where the process of stimulated emission occurs. During this process, an excited state molecule relaxes and emits a photon that will then perturb another excited state molecule, causing it to emit a second photon. This amplifies the light, which is then sent directly out of the laser cavity.

c) The lasing material is first moved to an excited state with electrical current, causing the emission of highly coherent photons of reduced energy. These photons are passed through a high-power electrical amplifier, followed by a lens system designed to create light of high power and uniform polarization. The light is then passed into a gain medium, where the process of stimulated emission occurs as a photon emitted from an excited state molecule that perturbs another excited state molecule, causing the emission of an identical photon and a population inversion. The wavelength of the output photons can be tuned using a birefringent filter, allowing the use of frequencies of a wide range.

A red laser pointer emits light at a wavelength of 635 nm. If the laser emits 7.5 X 10^(-4) of energy per second in the form of visible radtion, how many photons per second are emitted from the laser?

I know the answer, I would just like a step by step explanation so I can learn how to do it.

6.22
If you put 120 volts of electricity through a pickle, the picklewill smoke and start glowing an orange-yellow color. The light isemitted because the sodium ions in the pickle become excited; theirreturn to the ground state results in light emission (see Figure6.13b and Sample Exercise 6.3).
(a) The wavelength of this emitted light is 589 nm. Calculate itsfrequency.
(b) What is the energy of 0.10 mole of these photons?
(c) Calculate the energy gap between the excited and ground statesfor the sodium ion.
(d) If you soaked the pickle for a long time in a different saltsolution, such as strontium chloride, would you still observe 589nm light emission? Why or why not?