NCERT Class XII Chapter <br>Dual Nature of Radiation and Matter <br> Questions With Solutions

NCERT Class XII Chapter
Dual Nature of Radiation and Matter
Questions With Solutions

Question : 9

Total: 37

The work function for a certain metal is 4.2 eV. Will this metal give photoelectric emission for incident radiation of wavelength 330 nm?

Solution:

Let us calculate the energy associated with photons incident
E =

6.63×10−34×3×108

330×10−9

= 6.027 × 10−19 J
E =

6.027×10−19

1.6×10−19

eV = 3.77 eV
Since, energy of incident photons i.e., 3.77 eV is less than work function, hence no emission will take place.

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