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Help with wavelength of laser question - HSN forum

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Help with wavelength of laser question


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#1 jambo david

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Posted 24 April 2006 - 04:03 PM

Photons with a frequency of x 10 14 Hz are incident on excited atoms, causing the atoms to emit their excess energy.

Calculate the wavelength of the laser light produced. Give your answer to the nearest nanometre.

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#2 The Wedge Effect

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Posted 24 April 2006 - 04:15 PM

Do they not give you a proper value, like 5x1014 Hz?

This is a simple case of using the formula 

\begin{align*}\lambda=vf\end{align*}

...I'm not sure if the formula's right, it's been a long time since I used it.

#3 dfx

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Posted 24 April 2006 - 04:50 PM

The formula is f = v/lambda.

#4 jambo david

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Posted 24 April 2006 - 05:08 PM

QUOTE(dfx @ Apr 24 2006, 05:50 PM) View Post

The formula is f = v/lambda.

Sorry

Photons with a frequency of 6.45*10^14 Hz are incident on excited atoms, causing the atoms to emit their excess energy.

Calculate the wavelength of the laser light produced. Give your answer to the nearest nanometre



The answer i got was 4.65*10^-7 however, the answer should be .465*10^3 blink.gif

#5 dfx

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Posted 24 April 2006 - 05:18 PM

Hmmm... have they given any information about the work function?

#6 jambo david

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Posted 24 April 2006 - 05:34 PM

QUOTE(dfx @ Apr 24 2006, 06:18 PM) View Post

Hmmm... have they given any information about the work function?

nope just exactly as i wrote above. It's scholar though and i know they have a few mistakes biggrin.gif

#7 dfx

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Posted 24 April 2006 - 09:25 PM

Ah, probably is a mistake. Just the decimal places that they seemed to have got wrong.





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