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### Topic: Calculating the Energy of a Photon  (Read 4671 times)

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#### Zeugma

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##### Calculating the Energy of a Photon
« on: October 10, 2009, 10:02:23 AM »
Hi there!

I'm in need of some homework help:

A mercury atom drops from 1.413 x 10-18 J to 1.069 x 10-18 J. What is the energy of the photon emitted by the mercury atom?

I know how to use Ephoton to find energy but only when the frequency is given. Why are there two figures given in the question and what do I do with them?

Thank you.

#### cliverlong

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##### Re: Calculating the Energy of a Photon
« Reply #1 on: October 10, 2009, 04:38:05 PM »
You are given a start energy value and a finish energy value. Which arithmetic operation do you think you need to calculate an energy from these two values?

Clive

#### Zeugma

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##### Re: Calculating the Energy of a Photon
« Reply #2 on: October 10, 2009, 09:26:36 PM »
You are given a start energy value and a finish energy value. Which arithmetic operation do you think you need to calculate an energy from these two values?

Clive
Subtraction! (I just subtract them?)

#### cliverlong

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##### Re: Calculating the Energy of a Photon
« Reply #3 on: October 11, 2009, 02:23:54 AM »
Seems reasonable to me.