7.
Light emerging from a nicol prism has
Answer : C. Vibration in tow mutually perpendicular directions
8.
Raman effect is due to
Answer : A. Scattering of light
9.
In a standing wave the distance between a node and adjacent antinode is
Answer : C. lamda / 4
10.
X-rays cannot pass through
Answer : B. bone
11.
The phenomenon which cannot be explained by wave theory is
Answer : C. photo electric emission
12.
What is the principle of a thermopile?
Answer : B. Seebeck effect