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$\text{p}\neq0,\text{ E}=0$
- ✓$\text{p}\neq0,\text{ E}\neq0$
- D$\text{p}=0,\text{ E}=0$
✓
Answer
Correct option: C.
$\text{p}\neq0,\text{ E}\neq0$
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
The capacitance of a parallel plate capacitor is $5\, \mu F$ . When a glass slab of thickness equal to the separation between the plates is introduced between the plates, the potential difference reduces to $1/8$ of the original value. The dielectric constant of glass is
→A person who can see things most clearly at a distance of $10\, cm$. Requires spectacles to enable to him to see clearly things at a distance of $30 \,cm$. What should be the focal length of the spectacles
→The given figure represents an arrangement of potentiometer for the calculation of internal resistance $(r)$ of the unknown battery $(E)$. The balance length is $70.0\, cm$ with the key opened and $60.0\,cm$ with the key closed. $R$ is $132.40 \Omega $. The internal resistance $(r)$ of the unknown cell will be.......$\Omega$ (Given $E_o > E$) :-
→Regarding a semiconductor which one of the following is wrong
The decay constant of a radio active substance is $0.173\, (years)^{-1}.$ Therefore :
→In the circuit shown, a four wire potentiometer is made of a $400\, cm$ long wire, which extends between $A$ and $B$. The resistance per unit length of the potentiometer wire is $r = 0.01\, \Omega /cm$. If an ideal voltmeter is connected as shown with jockey $J$ at $50\, cm$ from end $A$, the expected reading of the voltmeter will be: ............... $V$
→Photons are deflected by:
Which of the following waves have a maximum frequency?
Consider the following electronic energy level diagram of $H-$ atom: Photons associated with shortest and longest wavelengths would be emitted from the atom by the transitions labelled:
→Gauss’s law is true only if force due to a charge varies as