Question

What is the maximum wavelength of light that will cause photoelectron to be emitted from sodium. ? What will the maximum kinetic energy of photoelectron be if 200 nm light fall on sodium surface. ?

Answer 1

Answer:

When electromagnetic radiation of wavelength 300 nm falls on the surface of sodium, electrons are emitted with kinetic energy of 1.68×105Jml-1.

Explanation:

Answer 2

Answer:

We know,

sodium work function 2.3eV

         W= hc/λ

λ=hc/W=(1.24×10^(-15)  eV m)/(2.3 eV)=539nm

We know,

E= W+ kE

kE=E-W

kE= (1.24×10^(-6)  eV m)/(200×10^(-19)  m)-2.3=3.9 eV

Explanation: