1. Physics 213 General Physics
Physics 213 General Physics
Final Review 1
Demos: Model Door with Spring Meter; Rope Pulls Door Handle; Pivoting Rectangle with Strings; Falling Weight Rotates Pulley
Videos: none
Transparencies: Net Torque (Problem); Two Blocks and Pulley (Problem)

2. A hydrogen atom in the ground state absorbs a 12. 75-eV photon
A hydrogen atom in the ground state absorbs a eV photon. To what level is the electron promoted? (The ionization energy of hydrogen is 13.6-eV).
n=2
n=3
n=4
n=5
n=6

3. The quantum mechanical model of the hydrogen atom requires that if the orbital quantum number = 5 for a specific principal quantum number state, how many possible substates exist for that specific orbital? 5 8 10 11 22

4. Which of the following transitions in hydrogen from an initial state (ni) to a final state (nf) results in the most energy emitted?
(a) ni = 80, nf = 2
(b) ni = 3, nf = 95
(c) ni = 2, nf = 1
(d) ni = 1, nf = 3
(e) ni = 95, nf = 3

5. A flame emits light as an ideal blackbody
A flame emits light as an ideal blackbody. When is the flame hotter; when it glows red or blue?

6. If the flame is at a temperature such that it is mostly emitting red visible light, we can assume all of the visible photons have a wavelength of approximately 630 nm. If the power of visible light emitted by the flame is 2 watts, approximately how many visible photons per second are emitted by the flame? (h = 6.63 x Js = 4.14 x eVs, c=3 x 108 m/s)

7. Surface #1 has work function j1, and when bombarded with photons of wavelength l1 emits photoelectrons with maximum energy KE1. Surface #2 has work function j2, and when bombarded by photons of wavelength l2 emits photoelectrons with maximum energy KE2. If j1 > j2, then which of the following must be true?
KE1 > KE2
l1 > l2
lC for surface #1 is greater than lC for surface #2.
lC for surface #2 is greater than lC for surface #1.
None of the above.

8. As the temperature of a radiation emitting blackbody becomes higher, what happens to the peak wavelength of the radiation?
Increases.
Decreases.
Remains constant.
It is directly proportional to temperature.
None of the above.

9. A mass is bouncing on the end of a spring with a period T when measured by a ground observer. What would the period of oscillation be (as measured by the same observer) if the mass and spring were moving past the ground observer at a speed of 0.80 c?
0.44 T
0.60 T
1.0 T
1.7 T
2.7 T

10. How fast would a rocket have to move past a ground observer if the latter were to observe a 4.0% length shrinkage in the rocket length? (c = 3.00  108 m/s)
0.12  108 m/s
0.28  108 m/s
0.85  108 m/s
1.2  108 m/s
3.1  108 m/s

11. A given individual is able to see objects clearly only when they are beyond 100 cm. If this person would like to be able to read text held as close as 25.0 cm from their eye, what focal length eye glasses should be used?
100 cm
25.0 cm
75.0 cm
100 cm
33.3 cm