# Physics

Find the energy (in joules) of the photon that is emitted when the electron in a hydrogen atom undergoes a transition from the n=7 energy level to produce a line in the Paschen series.

1. 👍 0
2. 👎 0
3. 👁 71
1. Paschen series are to n=3

n=7 so n^2 = 49
n=3 so n^2 = 9

use the Rydberg formula

1/lambda = Rh(1/9 - 1/49)

where Rh = 1.097 x 10^7 m^-1

then convert the wavelength (lambda) to energy using E=hf

1. 👍 0
2. 👎 0
posted by Dr Russ

## Similar Questions

1. ### physics science

3. An unknown element produces a spectral line of 425nm. A. Calculate the energy of the emitted photon in joules. B. What is the energy of the emitted photon in electron-volts?

asked by suszan on January 23, 2012
2. ### chemistry

When a photon of light hits the surface of a metal, a photoelectron may be emitted. Some of the photon's energy is required to free the electron from the surface. The remaining energy becomes the kinetic energy of the

asked by Kristen on October 21, 2013
3. ### physics

You are shining ultraviolet light on a gas of an unknown element. You know that an electron starts in a ground state with an energy of -19.10 eV. The electron absorbs a 4.00-eV photon. The electron immediately drops to an

asked by Brianna on May 20, 2010
4. ### Science

I have a question from an old exam that I need help to understand, i'm not sure where to start An electron in an electronically excited hydrogen atom undergoes a transition from a 6d to a 2p orbital, resulting in the emission of a

asked by Dan on October 15, 2015
5. ### science

I have a question from an old exam that I need help to understand, i'm not sure where to start An electron in an electronically excited hydrogen atom undergoes a transition from a 6d to a 2p orbital, resulting in the emission of a

asked by alyssa on October 16, 2015
6. ### Chemistry

I have this question from an old exam for review. I tried the question but can't get the right answers. An electron in an electronically excited hydrogen atom undergoes a transition from a 6d to a 2p orbital, resulting in the

asked by Kara on June 13, 2017
7. ### Chemistry

I have this question from an old exam for review. I tried the question but can't get the right answers. An electron in an electronically excited hydrogen atom undergoes a transition from a 6d to a 2p orbital, resulting in the

asked by Kara on June 13, 2017
8. ### Physics

A photon of energy E strikes an electron at rest undergoes pair production, producing a positive electron(positron) and an electron, photon+electron produce positron+electron+electron The two electrons and the positron move off

asked by Abby on March 22, 2011
9. ### electron

An electron drops from the fourth energy level, in an atom to the third level and then to the first level. Two frequencies of light are emitted. How does their combined energy compare with the energy of the single frequency that

asked by Jarrad Schomaker on June 28, 2005
10. ### physics

Please help me answer the question below and also show equations and steps of how you came to your answer. Thank you 1. The electron in a hydrogen tom is in the first excited state, when the electron acquires an additional 2.86eV

asked by jennifer on September 10, 2008

More Similar Questions