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[物理]帮忙,两道很长时间没解开的题 [复制链接]

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发表于 2005-11-10 22:30:34 |只看该作者 |倒序浏览
An atom in an excited state with angular momentum quantum number J = 1 and magnetic quantum number Jz = 0 decays by electric dipole radiation to a state with total angular momentum zero. Which of the following statements is true?

(A)    No photons will be emitted along the z-axis.

(B)    Light emitted along the x-axis will be polarized along the y-axis.

(C)    The photons will be emitted isotropically.

(D)   The particles of the initial and final states are equal.

(E)    More photons will be emitted with wave vector kz > 0 than with kz < 0.

光子被辐射出来时,偏振和什么有关?



33. A proton with rest energy of approximately 1 GeV (109 electron volts) and total energy of 3 GeV interacts with another proton at rest. Which of the following could NOT be among the products of this reaction?

(A)    An antiproton.

(B)    A proton.

(C)    A pion (rest energy = 0.14 GeV).

(D)   Two pions.

(E)    A kaon (rest energy = 0.49 GeV).
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发表于 2005-11-11 08:27:54 |只看该作者
第一题选A,因为光子角动量只可能在XY平面,所以在z方向不能观察到
第二题选E,如果该反应成立,则奇异数不守恒,而没有轻子参与作用,所以不是弱相互作用
Hope is always there!

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RE: [物理]帮忙,两道很长时间没解开的题 [修改]

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[物理]帮忙,两道很长时间没解开的题
https://bbs.gter.net/thread-361406-1-1.html
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