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【简答题】
(1)根据玻尔理论证明:氢原子基态的轨道半径为玻尔半径 (2)氢原子基态的径向波函数为 式中A为常数,求r为何值时电子出现的概率密度最大?
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举一反三
【单选题】Birds, _______ or familiar, were popular in Rome.
A.
historic
B.
exotic
C.
alcoholic
D.
erotic
【单选题】The giant was sad because there were no birds, flowers and leaves outside the garden.
A.
真
B.
False
【单选题】Mass deaths of birds were not unheard of, but they normally happened unnoticed at sea or in rural areas away from towns. Many birds are weak and die in winter _______ food is scarce.
A.
which
B.
what
C.
when
D.
how
【单选题】The yellows used to paint the sun were only faintly _________ from the other yellows used throughout the whole day.
A.
disproved
B.
differentiated
C.
discriminated
D.
discerned
【单选题】The birds were very friendly to Bill Pochmerski, one of the volunteer observers, because he wore a neutral mask.
A.
Y
B.
N
C.
NG
【单选题】Even in winter the roadsides were places of beauty, _______ countless birds came to feed on the berries and on the seed heads of the dried weeds rising above the snow.
A.
which
B.
when
C.
where
D.
what
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