(B) The energy flux (intensity) is given by $I = 25 \times 10^4 \, W/m^2$.The surface area is $A = 15 \, cm^2 = 15 \times 10^{-4} \, m^2$.The speed of

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

(B) The energy flux (intensity) is given by $I = 25 \times 10^4 \, W/m^2$.The surface area is $A = 15 \, cm^2 = 15 \times 10^{-4} \, m^2$.The speed of light is $c = 3 \times 10^8 \, m/s$.For a perfectly reflecting surface,the momentum transferred per unit time (force) is given by the formula $F = \frac{2IA}{c}$.Substituting the values:$F = \frac{2 \times (25 \times 10^4) \times (15 \times 10^{-4})}{3 \times 10^8}$$F = \frac{2 \times 25 \times 15 \times 10^0}{3 \times 10^8}$$F = \frac{750}{3} \times 10^{-8} \, N$$F = 250 \times 10^{-8} \, N = 2.50 \times 10^{-6} \, N$.

Class 12 Physics Dual Nature of Radiation and Matter Radiation Force and Pressure

Medium

Light with an energy flux of $25 \times 10^4 \, W/m^2$ falls on a perfectly reflecting surface at normal incidence. If the surface area is $15 \, cm^2$,the average force exerted on the surface is:

AIPMT 2014 All AIPMT

A
$1.25 \times 10^{-6} \, N$
B
$2.50 \times 10^{-6} \, N$
C
$1.2 \times 10^{-6} \, N$
D
$3 \times 10^{-6} \, N$

Explore More

Browse All

Question Bank

All Subjects

Class 12 Questions

Class 12

Physics Questions

Chapter

Dual Nature of Radiation and Matter

Subtopic

Radiation Force and Pressure

Previous Year

AIPMT 2014 Paper All AIPMT years →

If the total energy transferred to a surface in time $t$ is $6.48 \times 10^5 \,J$, then the magnitude of the total momentum delivered to this surface for complete absorption will be:

DifficultJEE MAIN 2024

View Solution

Average force exerted on a non-reflecting surface at normal incidence is $2.4 \times 10^{-4} \,N$. If $360 \,W/cm^2$ is the light energy flux during a span of $1$ hour $30$ minutes,then the area of the surface is: (in $\,m^2$)

DifficultJEE MAIN 2024

View Solution

Find the compression in the spring with spring constant $K = 5 \ N/m$ which is attached to a metal plate of area $50 \ m^2$. Light of intensity $I = 40 \ MW/m^2$ is incident at an angle of $60^o$ on the metal plate,and the coefficient of reflection is $\rho = 0.5$ for the plate. (in $m$)

View Solution

An astronaut floating freely in space decides to use his flashlight as a rocket. He shines a $10$ $W$ light beam in a fixed direction so that he acquires momentum in the opposite direction. If his mass is $80$ kg,how long must he shine the light to reach a velocity of $1$ $m/s$?

Medium

View Solution

$A$ pulse of light of duration $100 \ ns$ is absorbed completely by a small object initially at rest. The power of the pulse is $30 \ mW$ and the speed of light is $3 \times 10^8 \ m/s$. The final momentum of the object is:

DifficultIIT 2013

View Solution

Vedclass Products

For Students

Vedclass Test Series

Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.

Start Free Trial

For Teachers

Exam Paper Generator

Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.

Try Free

For Institutes

Online Exam Module

Live online exams with unlimited students, 360° analytics & white-label branding.

See Demo

Light with an energy flux of $25 \times 10^4 \, W/m^2$ falls on a perfectly reflecting surface at normal incidence. If the surface area is $15 \, cm^2$,the average force exerted on the surface is:

Similar Questions

If the total energy transferred to a surface in time $t$ is $6.48 \times 10^5 \,J$, then the magnitude of the total momentum delivered to this surface for complete absorption will be:

Average force exerted on a non-reflecting surface at normal incidence is $2.4 \times 10^{-4} \,N$. If $360 \,W/cm^2$ is the light energy flux during a span of $1$ hour $30$ minutes,then the area of the surface is: (in $\,m^2$)

Find the compression in the spring with spring constant $K = 5 \ N/m$ which is attached to a metal plate of area $50 \ m^2$. Light of intensity $I = 40 \ MW/m^2$ is incident at an angle of $60^o$ on the metal plate,and the coefficient of reflection is $\rho = 0.5$ for the plate. (in $m$)

An astronaut floating freely in space decides to use his flashlight as a rocket. He shines a $10$ $W$ light beam in a fixed direction so that he acquires momentum in the opposite direction. If his mass is $80$ kg,how long must he shine the light to reach a velocity of $1$ $m/s$?

$A$ pulse of light of duration $100 \ ns$ is absorbed completely by a small object initially at rest. The power of the pulse is $30 \ mW$ and the speed of light is $3 \times 10^8 \ m/s$. The final momentum of the object is:

Vedclass Test Series

Exam Paper Generator

Online Exam Module