MCQ
A plane electromagnetic wave is incident on a material surface. The wave delivers momentum p and energy E.
- A$\text{p}=0,\text{ E}\neq0$
- B$\text{p}\neq0,\text{ E}=0$
- C$\text{p}\neq0,\text{ E}\neq0$
- D$\text{p}=0,\text{ E}=0$
✓
Answer
- $\text{p}\neq0,\text{ E}\neq0$
Explanation:
When an electromagnetic wave strikes a material surface, it transports the momentum, as well as the energy, to the surface. The striking electromagnetic wave exerts pressure on the surface. The total energy transferred to the surface by the electromagnetic wave is given by $\text{E}=\text{pc}$ Therefore, $\text{p}\neq0,\text{ E}\neq0$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
An archaeologist analyses the wood in a prehistoric structure and finds that 
(Half life = 5700 years) to 
is only one- fourth of that found in the cells buried plants. The age of the wood is about
|
(a) 5700 years |
(b) 2850 years |
(c) 11,400 years |
(d) 22,800 years |
Which one of the following is the weakest kind of bonding in solids
|
(a) Ionic |
(b) Metallic |
(c) Vander Waals |
(d) Covalent |
An element A decays into element C by a two step process :
A → B + 
B → C + 
Then
|
(a) A and C are isotopes |
(b) A and C are isobars |
|
(c) A and B are isotopes |
(d) A and B are isobars |
The heat developed in an electric wire of resistance R by a current I for a time t is
|
(a) |
(b) |
(c) |
(d) |
At magnetic poles of earth, angle of dip is
| (a) Zero | (b) 45o | (c) 90o | (d) 180o |
In Bohr's model, the atomic radius of the first orbit is 
, then the radius of the third orbit is
|
(a) |
(b) |
(c) |
(d) |
Hydrogen atom excites energy level from fundamental state to n = 3. Number of spectral lines according to Bohr, is?
The splitting of white light into several colours on passing through a glass prism is due to
|
(a) Refraction |
(b) Reflection |
(c) Interference |
(d) Diffraction |
If the values of L, C and R in a series L - C - R circuit are $100\text{mH},100\mu\text{F}$ and $100\Omega$ respectively then the value of resonant frequency will be.
→Metallic solids are always opaque because
|
(a) Solids effect the incident light |
|
(b) Incident light is readily absorbed by the free electron in a metal |
|
(c) Incident light is scattered by solid molecules |
|
(d) Energy band traps the incident light |