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Physical Chemistry

Blazing goIITian

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10 Oct 2008 13:16:37 IST

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653

Atomic structure-Ineresting one!!!!

None

Calculate the ratio between the wavelength of an elecron and a proton if the proron is moving with the velocity of electron????

I calculated it to be 1833

But the given answer is half of it ,i.e., 916.5

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Comments (10)

Rohit

Blazing goIITian

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10 Oct 2008 13:18:21 IST

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Use mass of electron-

mass of proton-

Rohit

Blazing goIITian

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10 Oct 2008 21:27:17 IST

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Please answer anyone

Rohit

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10 Oct 2008 22:00:44 IST

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Will rate each answer

rohit

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10 Oct 2008 22:11:54 IST

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your answer is right.

i equated 1/2 mv² with hc/lamda

maybe we have to take the rotational KE of the electron and the proton

Rohit

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10 Oct 2008 22:25:02 IST

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But why??

Rohit

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10 Oct 2008 23:17:11 IST

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Help please

Priyesh

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10 Oct 2008 23:36:00 IST

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lamda = h/mv

since v is same

lambda is inversely proportional to mass so

lambda(electron) / (lambda(proton) = mass(proton) / mass(electron) = 1833

Rohit

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10 Oct 2008 23:39:09 IST

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But the given answer is half of it

Govind Malhotra

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11 Oct 2008 16:38:39 IST

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i think ur answer is right it's 1833.

Viraj Malkar

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12 Oct 2008 16:37:15 IST

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The wavelength of a particle by De-Broglie's experment is

Wavelength = Plank's Const / (mass of particle * Its velocity)

Therefore

For finding the ratio of the wavelength of electron is to wavelength of proton,we simply have to divide the masses of proton with the mass of electron as the velocity of both the particles is same.

i.e (Lambda elec)/(Lambda proton) = (h/mass of electron*vel) * (mass of proton*vel/h)

= mass of proton / mass of electron

= 1833 approximetly.

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