THE UNIVERSITY OF BRITISH COLUMBIA
 
Science 1 Physics Assignment # 9:
 
QUANTUM MECHANICS
 
Wed. 15 Nov. 2000 - finish by Wed. 22 Nov.

1.

Photon Drive: A laser generates 1 kW of power continuously in a beam of light of wavelength $\lambda = 600$ nm. The beam uniformly illuminates a circular spot 1 cm in radius.

(a)

How many photons does the beam contain per unit volume?

(b)

What is the momentum of a single photon in the beam?

(c)

If the beam is completely absorbed by a blackbody, what thrust (force) does it exert on the blackbody?

. . . and Tipler (4$^{\rm th}$ Edition)

Ch. 17: problems 62 , 65 , 73 and 84