1. A hydrogen gas is illuminated by UV photons having just the right energy to e
ID: 1295855 • Letter: 1
Question
1.
A hydrogen gas is illuminated by UV photons having just the right energy to excite
the electrons in the hydrogen atoms up to the n=3 state. When the electrons drop back
down to their ground state, which spectral sequence(s) can be produced?
Balmer (visible) and Lyman (UV) series
Lyman (UV) series only
Paschen (IR), Balmer (visible) and Lyman (UV) series
Balmer (visible) only
2.
Infrared photons shine on a particular piece of metal, causing electrons to pop off the metal (photoelectric effect). What happens if we now shine visible photons of the same brightness on the metal?
More photoelectrons will be produced, but they will have more energy
Fewer photoelectrons will be produced, but they will have the same amount of energy
The same number of photoelectrons will be produced, but they will have more energy
The same number of photoelectrons will be produced, and they will have the same energy
3.The energy of a photon of light differs from that of a mechanical wave (such as a wave on a rope) in that it depends upon
Amplitude
Frequency
Speed
Polarization
A.Balmer (visible) and Lyman (UV) series
B.Lyman (UV) series only
C.Paschen (IR), Balmer (visible) and Lyman (UV) series
D.Balmer (visible) only
Explanation / Answer
1. B. lyman beta series
2. B fewer electrons will be produced , but they will have the same amount of energy
3 B frequency
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