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Topic: What is the energy of an electron if it has wavelength 7.2 x 10 ^ -10 m ?  (Read 3634 times)

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Offline plyrjohn404

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What is the energy of an electron if it has wavelength 7.2 x 10 ^ -10 m ?
« on: June 14, 2009, 01:02:47 AM »
What is the energy of an electron if it has wavelength 7.2 x 10 ^ -10 m ?
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Offline Schrödinger

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Re: What is the energy of an electron if it has wavelength 7.2 x 10 ^ -10 m ?
« Reply #1 on: June 21, 2009, 05:22:07 AM »
Let $$ \lambda /$$ represent the wavelength of the electron.

$$ \lambda = \frac{h}{mv} /$$

h = Planck's constant ; m = mass of electron ; v = velocity of electron }

Once you find $$ v /$$ you can easily find the kinetic energy from

$$ KE = \frac{mv^2}{2} /$$
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Offline dolimitless

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Re: What is the energy of an electron if it has wavelength 7.2 x 10 ^ -10 m ?
« Reply #2 on: June 22, 2009, 03:50:58 AM »
Don't you just use the formula E = hc / λ ?
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Offline Schrödinger

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Re: What is the energy of an electron if it has wavelength 7.2 x 10 ^ -10 m ?
« Reply #3 on: June 22, 2009, 12:22:50 PM »
i thought u were asking for kinetic energy..\

Doesn't $$ E=\frac{hc}{\lambda} /$$ give u total energy??

Correct me if i'm wrong
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"Destiny is not a matter of chance; but a matter of choice. It is not a thing to be waited for; it is a thing to be achieved."
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