lect of the B f states of the hypothetical atom. pression for the angular ainly less momentum of a uniform spinning ball of mass me radius r, and equatorial speed v. By equating this to the observed spin V3h/2, find the minimum possible els (b) When B 0.there is a sin sponding to the 2p-1s transi does this become when B is swite fractional separation Af/fo betw value of v. What is v/c? 9.17* Consider two levels of the which the spins are antiparalle an s state (I 0). In the highe tron occupies ad state (I 2 it occupies a p state (I 1). of both levels resulting from the z axis. (b) Imagine a tran states, with L, = mh, to o L mh. Since m, can be can be 1,0, or-1, there are ceivable transitions. How SECTION 9.3 (Magnetic Moments) 9.9 A current of 0.4 A flows around a single circular loop of radius 1 cm. (a) What is the resulting magnet- ic moment, u? (b) If the loop is placed in a magnetic field B 1.5 T, with u perpendicular to B, what is the torque on the loop? (c) What is the difference in energy between the cases that u is parallel to B and antiparallel? 9.10 The SI units of magnetic moment u are ampere meter. According to (9.13), the magnetic moment of an orbiting electron is = energies would these 15 tra all of these 15 transitions the only transitions observ (m - m) (A restriction like this on t is called a selection rule, Prove that because of the three distinct photon (9.35) e L 2me וt ותווfS.

lect of the B f states of the hypothetical atom. pression for the angular ainly less momentum of a uniform spinning ball of mass me radius r, and equatorial speed v. By equating this to the observed spin V3h/2, find the minimum possible els (b) When B 0.there is a sin sponding to the 2p-1s transi does this become when B is swite fractional separation Af/fo betw value of v. What is v/c? 9.17* Consider two levels of the which the spins are antiparalle an s state (I 0). In the highe tron occupies ad state (I 2 it occupies a p state (I 1). of both levels resulting from the z axis. (b) Imagine a tran states, with L, = mh, to o L mh. Since m, can be can be 1,0, or-1, there are ceivable transitions. How SECTION 9.3 (Magnetic Moments) 9.9 A current of 0.4 A flows around a single circular loop of radius 1 cm. (a) What is the resulting magnet- ic moment, u? (b) If the loop is placed in a magnetic field B 1.5 T, with u perpendicular to B, what is the torque on the loop? (c) What is the difference in energy between the cases that u is parallel to B and antiparallel? 9.10 The SI units of magnetic moment u are ampere meter. According to (9.13), the magnetic moment of an orbiting electron is = energies would these 15 tra all of these 15 transitions the only transitions observ (m - m) (A restriction like this on t is called a selection rule, Prove that because of the three distinct photon (9.35) e L 2me וt ותווfS.