(a) An electromagnetic wave of intensity 190 W/m2 is incidentnormally on a rectangular black card with sides of 25 cm and 38 cmthat absorbs all the radiation. Find the force exerted on the cardby the radiation.

(b) Find the force exerted by the same wave if the card reflectsall the radiation incident on it.

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Casey DurganLv2

9 Mar 2019

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Related questions

The intensity of sunlight at the Earth's distance from the Sun is 1370 W/m2.

(a) Assume the Earth absorbs all the sunlight incident upon it. Find the total force the Sun exerts on the Earth due to radiation pressure.

(b) Explain how this force compares with the Sun's gravitational attraction.

Strength______________ times stronger

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A plane electromagnetic wave of intensity 6.00 W/m2, moving in thex direction, strikes a small pocket mirror, of area 48.0 cm2, heldin the yz plane.
(a) What momentum does the wave transfer to the mirror eachsecond?
1.92E-10 kgÂ·m/s

(b) Find the force that the wave exerts on the mirror.
1.92E-10 N

Please show how a) and b) have the same answer, i tried manydifferent ways but still couldnt get it

Solar Sail

A solar sail allows a spacecraft to use radiation pressure for propulsion, similar to the way wind propels a sailboat. The sails of such spacecraft are made out of enormous reflecting panels. The area of the panels is maximized to catch the largest number of incident photons, thus maximizing the momentum transfer from the incident radiation.

For such spacecraft to work, the force from the radiation pressure exerted by the photons must be greater than the gravitational attraction to the star emitting the photons. The critical parameter is the area density (mass per unit area) of the sail.

Part A

Consider a perfectly reflecting mirror oriented so that solar radiation of intensity is incident upon, and perpendicular to, the reflective surface of the mirror. If the mirror has a surface area, what is the magnitude of the average force due to the radiation pressure of the sunlight on the mirror?

Express your answer in terms of the intensity, the mirror's surface area, and the speed of light.

ANSWER:

(2IA)/c
Correct

To solve the second part of this problem you will need to know the following: