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A small laser emits light at power 5.00m/w and wavelength 633nm. The laser beam is focused (narrowed) until its diameter matches the 1266nm diameter of a sphere placed in its path. The sphere is perfectly absorbing and has density . What are (a) the beam intensity at the sphere鈥檚 location (b) the radiation pressure on the sphere? (c) the magnitude of the corresponding force? And (d) the magnitude of the acceleration that force alone would give the sphere?

Short Answer

Expert verified
  1. Beam intensity at the sphere鈥檚 location is 3.974109W/m2.
  2. The radiation pressure on the sphere is 13.25 Pa.
  3. The magnitude of the corresponding force is1.66710-11鈥塏.
  4. The magnitude of the acceleration that force would give the sphere is 3.14103m/s2.

Step by step solution

01

Step 1: Given data

Power is, I=5.010-3W.

Diameter is, d=126610-9m.

Density is, =5000kg/m3.

02

Determining the concept

Intensity is the power transferred per unit area, where the area is measured on the plane perpendicular to the direction of the propagation of the energy. The intensity or flux of radiant energy is the power transferred per unit area, where the area is measured on the plane perpendicular to the direction of propagation of the energy. In the SI system, it has a unit of watts per square meter or kg鈰卻鈦宦 in base units.

Intensity (I),

I=PowerArea

Radiation pressure (Pr),

Pr=Ic

Where, I is the intensity, Pr is the radiation pressure, and c is the speed of light.

03

(a) Determining the beam intensity at the sphere’s location

Intensity (I)can be calculated as,

I=Pd24

Substitute the values in the above expression, and we get,

I=5.010-3126610-924I=3.974109W/m2

Therefore, the beam intensity at the sphere鈥檚 location is 3.974109W/m2.

04

(b) Determining the radiation pressure on the sphere

Radiation pressure(Pr)can be calculated as,

Pr=Ic

Pr=(3.974109)3108Pr=13.2鈥塒补

Therefore, the radiation pressure on the sphere is 13.25Pa.

05

(c) Determining the magnitude of the corresponding force

The magnitude of the force (Fr) can be calculated as,

Fr=Prd24

Fr=13.25126610-924Fr=1.66710-11N

Therefore, the magnitude of the corresponding force is1.66710-11鈥塏

06

(d) Determining the magnitude of the acceleration that force would give the sphere

Mass can be calculated as,

m=d36

Substitute the values in the above expression, and we get,

m=5000126610-926m=5.3110-15kg

To find the acceleration of the sphere (a), we can use the equation as,

a=Frm

Substitute the values in the above expression, and we get,

a=1.66710-115.3110-15a=3.14103m/s2

Therefore, the magnitude of the acceleration that force would give the sphere is 3.14103m/s2.

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