Question

Light of wavelength 3500 Å is incident on two metals A and B, A of work function 4.2 eV and B of work function 1.19 eV respectively. The photoelectrons will be emitted by-

• A. Metal A
• B. Metal B
• C. Both A and B
• D. Neither metal A nor metal B

Answer 1

Answer: (B)

Metal B

Answer 2

E = $\frac { 12420 } { 3500 }$ = 3.54 eV

So electron will be emitted only from B.