MCQ
A plane electromagnetic wave is incident on a material surface. If the wave delivers momentum p and energy E, then
- Ap = 0, E = 0
- ✓p ¹ 0, E ¹ 0
- Cp ¹ 0, E = 0
- Dp = 0, E ¹ 0
✓
Answer
Correct option: B.
p ¹ 0, E ¹ 0
p ¹ 0, E ¹ 0
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
A $p-n$ photodiode is made of a material with a band gap of $2.0\, eV.$ The minimum frequency of the radiation that can be absorbed by the material is nearly
→Diffusion current in a p-n junction is greater than the drift current in magnitude:
Three identical charged balls each of charge $2 \,C$ are suspended from a common point $P$ by silk threads of $2 \,m$ each (as shown in figure). They form an equilateral triangle of side $1 \,m$.
→The ratio of net force on a charged ball to the force between any two charged balls will be ...........
A parallel plate capacitor has a plate separation of 0.01 mm and use a dielectric (whose dielectric strength is 19 KV/mm) as an insulator. The maximum potential difference that can be applied to the terminals of the capacitor is
Match List $I$ with List $II$.
→| List $I$ (Spectral Lines of Hydrogen for transitions from) | List $II$ (Wavelengths ($nm$)) |
| $A$ $n_2=3 \text { to } n_1=2$ | $I$ $410.2$ |
| $B$ $n_2=4 \text { to } n_1=2$ | $II$ $434.1$ |
| $C$ $n_2=5 \text { to } n_1=2$ | $III$ $656.3$ |
| $D$ $n_2=6 \text { to } n_1=2$ | $IV$ $486.1$ |
Choose the correct answer from the options given below:
The numerical aperture of a microscope is $0.12$, and the wavelength of light used is $600\,nm$. Then its limit of resolution will be nearly $.............-\,\mu\,m$
→A cell can be balanced against $110\,\, cm$ and $100\,\, cm$ of potentiometer wire, respectively with and without being short circuited through a resistance of $10 \,\,\Omega$. Its internal resistance is ............... $\Omega$
→In the given potentiometer circuit length of the wire $AB$ is $3\,m$ and resistance is $R=4.5\,\Omega $. The length $AC$ for no deflection in galvanometer is ............... $m$
→In a radioactive decay chain, the initial nucleus is ${}_{90}^{232}Th$. At the end there are $6\,\,\alpha -$ particles and $4\,\,\beta -$ particles with are emitted. If the end nucleus is ${}_Z^AX\,,\,A$ and $Z$ are given by
→When photon of wavelength ${\lambda _1}$ is incident on a metal surface then speed of ejected fastest electron is $v_1\, m/s$. If photon of wavelength ${\lambda _2}$ incident on the same metal then speed of ejected fastest electron is $v_2\, m/s$. Value of $v_2^2 - v_1^2$ will be
→