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What is the radius of a hydrogen atom whose electron moves at7.3×105m/s ?

Short Answer

Expert verified

The radius of the hydrogen atom =0.476nm

Step by step solution

01

given information

An electron, in a certain state n, moves with a speed equals to 7.3×105m/saround the hydrogen's nucleus

02

simplification

Our aim is to find the radius of the hydrogen atom. An electron, moving in a circular orbit raround a certain nucleus, makes a standing waves where

2πrn=nλ

Every particle, which has a certain momentum, has an associated wavelength where

λ=hp=hmv

By substituting (2) into (1), we get

2πrn=nhmcvnrn=nh2πmcvn

From Fig.(38.27) in the book, we know that.

role="math" localid="1650742362891" rn=n2aB(whereaDis the bohr radius)

By equating (3) and (4), we get

role="math" localid="1650742483141" n2aB=yh2πmevnn=h2πmevnaHs3

Hence the radius of the hydrogen atom, in which an electron moves with a speed equals to 7.3×105m/sin the third state, is

role="math" localid="1650742623215" r3=32×5.29×10-2nm=0.476nm

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