Radiation Pressure

A beam of white light is incident normally on a plane surface absorbing $70\%$ of the light and reflecting the rest. If the incident beam carries $10 \mathrm{W}$ of power, the force exerted by it on the surface is

A beam of light with intensity ${10}^{-3} \mathrm{N} {\mathrm{m}}^{-2}$ and cross sectional area $20 {\mathrm{cm}}^2$ is incident on a fully reflective surface at angle $45°$. Then the force exerted by the beam on the surface is

A light of intensity $12 \mathrm{W} {\mathrm{m}}^{-2}$ incidents on a black surface of area $4 {\mathrm{cm}}^2$. The radiation pressure on the surface is

A source of power $1.2\mathrm{MW}$ emits photon which incident on a surface $2.5 \mathrm{m}$ away out of which $50\%$ is reflected back, what is the radiation pressure on the surface?

A brilliant arc lamp delivers a luminous flux of $100 \mathrm{W}$ to a  $1 {\mathrm{cm}}^2$ absorber. The force due to radiation pressure is:

A point source of light emits isotropically with a power of $200 W$. The light is incident normally on a perfectly reflecting circular surface of radius $2\mathrm{cm}$ at a distance of $20 \mathrm{m}$ from the source. The force exerted by light on the surface is

Speed of light $c=3\times {10}^8 \mathrm{m} {\mathrm{s}}^{-1}$

A laser pointer has an output power of $1 \mathrm{mW}$ and emits light of wavelength $660 \mathrm{nm}$. if the beam from the pointer is incident normally on a perfectly reflecting mirror, the force exerted by the light beam on the mirror will be approximately,

Assertion $\left(A\right):$ Electromagnetic waves exert pressure, called radiation pressure. Reason $\left(R\right):$ This is because they carry energy.

A laser beam $(\mathrm{\lambda }=633 \mathrm{nm})$ has an average power of $3 \mathrm{mW}$. What will be the pressure exerted on a surface by this beam if the cross-sectional area is $3 {\mathrm{mm}}^2$? (Assume perfect reflection and normal incidence.)

An earth-orbiting satellite has a solar energy collecting panel with total area $5\mathrm{ }{\mathrm{m}}^2$. If solar radiations are perpendicular and completely absorbed, the average force associated with the radiation pressure is
(Solar constant$=1.4\mathrm{ }\mathrm{k}\mathrm{W} {\mathrm{m}}^{-2}$)

A plane electromagnetic wave is normally incident on a plane surface of area $A,$ and it is perfectly reflected. If average pressure exerted on the surface is $P,$ the energy incident on the surface in time $t$ is $(c$ is speed of light$)$

The incident intensity on a horizontal surface at sea level from sun is about $1 \mathrm{kW} {\mathrm{m}}^{-2}$. If $50\%$ of this intensity is reflected and $50\%$ is absorbed, then find the ratio of radiation pressure to atmospheric pressure $p_0=1\times {10}^5 \mathrm{Pa}$ at sea level

A radiation of energy $E$ falls normally on a perfectly reflecting surface. The momentum transferred to the surface is :

A perfectly absorbing surface intercepts a parallel beam of monochromatic light of power $10 \mathrm{W} \left(\lambda =500 \mathrm{n} \mathrm{m}\right)$ incident on it normally the force exerted by light beam on the surface is 

Light of intensity $I$ falls parallel to the axis on the curved surface of a perfectly reflecting right circular cone having semi vertical angle $\theta$ and base radius $R$ as shown in figure. The value of force acting on the cone due to light is (where $c$ is speed of light in vacuum)

A source of power $1.2 \mathrm{MW}$ emits photon which incident on a surface $2.5 \mathrm{m}$ away out of which $50\%$ is reflected back, what is the radiation pressure on the surface?

A $50 \mathrm{kg}$ girl wearing heel shoes balances on a single heel. The heel is circular with a diameter of $1 \mathrm{cm}$. What must be the pressure exerted by the heel on the horizontal floor? (Take, $g=10\mathrm{ }\mathrm{m}\mathrm{ }{\mathrm{s}}^{-2}$.)

The two femurs each of cross-sectional area $10\mathrm{ }{\mathrm{c}\mathrm{m}}^2$ support the upper part of a human body of mass $40\mathrm{ }\mathrm{K}\mathrm{g}$ . What is the average pressure sustained by the femurs ? (Take $\mathrm{g}=10\mathrm{ }\mathrm{m}\mathrm{ }{\mathrm{s}}^{-2})$

Calculate the momentum transferred to a surface when a radiation of energy $\mathit{\text{E}}$ falls normally on it. Assume that the reflectivity of the surface is unity.

Light  of intensity $25 \mathrm{W} {\mathrm{cm}}^{-2}$ is incident normally on a completely absorbing surface of area $25 {\mathrm{cm}}^2$. The momentum transferred to the surface in $40$ minute time duration will be: