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Work function of sodium is 2.3 eV. Does ...

Work function of sodium is 2.3 eV. Does sodium show photoelectric emission for orange light `(lambda=6800Å)`?
Given `h=6.63xx10^(-34)Js`

Text Solution

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The threshold wavelength of sodium
`lambda_0=(hc)/lambda=(6.6xx10^(-34) xx3xx10^8)/(2.3xx1.6xx10^(-19))=5380 Å`
As given wavelength `lambda`= 6800 Å lt threshold wavelength `lambda_0`=5380 Å, no photoelectric emission will take place.
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