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Chapter 31: Q. 53 (page 903)

A laser beam shines straight up onto a flat, black foil of mass m.

a. Find an expression for the laser power Pneeded to levitate the foil.

b. Evaluate Pfor a foil with a mass of 25渭驳.

Short Answer

Expert verified

a. The expression for laser power isP=c脳F.

b. In foil the value of power is7.35脳104W

Step by step solution

01

Expression for laser power (part a)

a.

If an object absorbs every time period鈭�t, the momentum changes as follows:

螖笔=energy absorbed螖迟路c

F=螖笔螖迟

=energy螖迟c

F=Pc

P=F脳c

02

Calculation of power (part b)

b.

Given value is,

m=25脳10-6g

P=c脳F

localid="1649970298839" P=3脳108ms脳25脳10-6g脳9.8

P=7.35脳104W

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