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Unformatted text preview: E 1 . The population diﬀerence divided by the sum of the populations is P-P 1 P + P 1 = e-E /kT-e-E 1 /kT e-E /kT + e-E 1 /kT = 1-e-( E 1-E ) /kT 1 + e-( E 1-E ) /kT ≈ 1-e Δ E/kT 2 ≈ Δ E 2 kT ≈ 3 . 5 10-6 Thus only about one in a million molecules contribute to the next magnetization of the sample. However there are of order 10 23 molecules present so the signal is due to about 10 17 magnetic moments....
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This note was uploaded on 03/01/2010 for the course PHYSICS 225 taught by Professor Rothberg during the Spring '10 term at University of Washington.
- Spring '10