Question

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有人知道我是哪裡算錯嗎(ಥ_ಥ)

=
78, When the electron in a hydrogen atom falls from the n= 3 excited energy level to the
ground state energy level, a photon with wavelength 2 is emitted. An electron having
x
this same wavelength would have a velocity of
A) 7.10 x 10 m/s.
D)
B) 2.93 x 10 m/s.
E)
C) 2.93 x 103 m/s.
Ans: A Category: Medium Section: 7.4
7.10 m/s.
3.00 x 108 m/s.

2.
E
RAL
the
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ry:
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holny ni
2 2 =21.10.(+ 2) = 11.10.2017
wy=0.91-10, 102:10
a =
6.63.1034
9.115. v
0.928-10?v=1.02-10)
ad v 1.4 104
ra
-=1.02.10
Foa
24
:
as
m