A plane electromagnetic wave of wave intensit | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(D) The intensity $I$ of the wave is $6 \, W/m^2$. The area $A$ of the mirror is $40 \, cm^2 = 40 	imes 10^{-4} \, m^2$.For a perfectly reflecting su

Vedclass · Accepted Answer

$1.6 	imes 10^{-10} \, kg \cdot m/s$

Vedclass · Answer

(D) The intensity $I$ of the wave is $6 \, W/m^2$. The area $A$ of the mirror is $40 \, cm^2 = 40 	imes 10^{-4} \, m^2$.For a perfectly reflecting surface,the momentum $p$ transferred by an electromagnetic wave in time $t$ is given by $p = \frac{2U}{c}$,where $U$ is the energy incident on the surface.The energy incident per second is $U = I 	imes A 	imes t = 6 	imes 40 	imes 10^{-4} 	imes 1 = 240 	imes 10^{-4} \, J = 0.024 \, J$.The momentum transferred per second is $p = \frac{2 	imes 0.024}{3 	imes 10^8} = \frac{0.048}{3 	imes 10^8} = 0.016 	imes 10^{-8} = 1.6 	imes 10^{-10} \, kg \cdot m/s$.

$A$ plane electromagnetic wave of wave intensity $6 \, W/m^2$ strikes a small mirror of area $40 \, cm^2$,held perpendicular to the approaching wave. The momentum transferred by the wave to the mirror each second will be:

Similar Questions

The electrostatic potential inside a charged spherical ball is given by $\phi = ar^2 + b$,where $r$ is the distance from the centre and $a, b$ are constants. Then the charge density inside the ball is

The frequency of a light ray is $6 \times 10^{14} \ Hz$. Its frequency when it propagates in a medium of refractive index $1.5$ will be:

For the energy levels in an atom,which of the following statements is(are) correct?

In which of the following pairs,the central atoms have the same number of lone pairs of electrons?

If $a^x = b$,$b^y = c$,and $c^z = a$,then the value of $xyz$ is:

Vedclass Test Series

Exam Paper Generator

Online Exam Module