Two identical jars of gas atoms are placed on a table at locations A and B. Rand

Question

Two identical jars of gas atoms are placed on a table at locations A and B. Randomly polarized light beams are shined into each jar. A has a red wavelength = 660 nm and B has a blue wavelength = 450 nm. The two beams excite the same maximum dipole moments, p_0, in the atoms. A barrier prevents the beam from traveling into a second jar. A power meter at the origin pointed at jar B, not jar A, reads a certain power P_B.

When this power meter is rotated 30 degrees to receive power instead from jar A, what power will it read? Give your answer as a multiple of P_B, with three significant figures.

(Please describe your work.)

Explanation / Answer

appy malus law as I = Io cos^2 theta

As Intensity I = power/area

so P = Po cos ^2 theta

for A , red wavelength

PA = Po cos^ 30

PA = 75% of Po

-----------------------------------

PB = 75% of P0

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