An Electromagnetic Wave of Intensity 100 W/m² Is Incident Normally

question 16

Multiple Choice

An electromagnetic wave of intensity 100 W/m² is incident normally on a square black card whose sides are 25 cm.If the card absorbs all of the radiation incident on it,the approximate force exerted by the wave on this card is

• A)64 nN
• B)16 nN
• C)42 nN
• D)10 nN
• E)None of these is correct.

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