sapling #22

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Hana Sigsbee 3B
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sapling #22

Postby Hana Sigsbee 3B » Sun Nov 01, 2020 11:40 pm

You use an electron microscope in which the matter wave associated with the electron beam has a wavelength of 0.0237 nm. What is the kinetic energy of an electron in the beam, expressed in electron volts?
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lauren_tran_1L
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Re: sapling #22

Postby lauren_tran_1L » Sun Nov 01, 2020 11:43 pm

Use the kinetic energy equation and de Broglie equation to find the velocity!
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vanessanguyen3I
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Re: sapling #22

Postby vanessanguyen3I » Sun Nov 01, 2020 11:44 pm

Hana Sigsbee 3A wrote:You use an electron microscope in which the matter wave associated with the electron beam has a wavelength of 0.0237 nm. What is the kinetic energy of an electron in the beam, expressed in electron volts?


You have use de broglie's equation and the KE equation (KE=1/2mv^2). First, rearrange De Broglie's equation so that you can solve for velocity. you should get v=h/m(lamda). Then sub that into the KE equation and plug in all the respective values. Hope this helps!
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