Dual Nature Of Matter Question 5

Question 5 - 29 January - Shift 1

The threshold wavelength for photoelectric emission from a material is $5500 \AA$. Photoelectrons will be emitted, when this material is illuminated with monochromatic radiation from a

A. $75 W$ infra-red lamp

B. $10 W$ infra-red lamp

C. $75 W$ ultra-violet lamp

D. $10 W$ ultra-violet lamp

Choose the correct answer from the options given below :

(1) B and C only

(2) A and D only

(3) C only

(4) C and D only

Show Answer

Answer: (4)

Solution:

Formula: Photoelectric Effect

$\lambda<5500 \AA$ for photoelectric emission

$\lambda _{uv}<5500 \AA$