Dual Nature Of Matter Question 5
Question 5 - 29 January - Shift 1
The threshold wavelength for photoelectric emission from a material is $5500 \mathring{A}$. 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
$\lambda<5500 \mathring{A}$ for photoelectric emission
$\lambda _{uv}<5500 \mathring{A}$
