1. A photon emitted from the nucleus of an atom contains energy. The ratio of the photon energy to the frequency is
 A. the speed of light
 B. the speed of light squared
 C. Planck's constant
 D. the photon wavelength
 E. the photon momentum


2. Photons can exhibit wave and particle properties. In which of these experiments are these properties evident?

Wave properties 
Particle properties 
A 
Double slit interference 
Diffraction 
B 
The photoelectric effect 
Double slit interference 
C 
Diffraction 
Double slit interference 
D 
The photoelectric effect 
Diffraction 
E 
Double slit interference 
The photoelectric effect 


3. In the photoelectric effect, light is incident on a clean metal plate and electrons are lost from the surface of the metal. The minimum amount of energy required to liberate a single electron is equal to
 A. the photon energy
 B. the work function of the metal
 C. the kinetic energy of the electron
 D. the stopping potential applied
 E. the photon wavelength


4. Which of the following graphs correctly shows the variation of kinetic energy of the emitted electrons with frequency of applied radiation?


5. A clean sodium metal is tested under a lamp, but no photoelectrons are emitted. To produce photoelectrons, what changes should take place?
 A. The metal should be replaced with a metal of higher work function
 B. A higher frequency light source should be used
 C. The lamp should be replaced with an identical one of higher power output
 D. A coherent light source should be used
 E. A longer wavelength light source should be used


6. Electrons orbit the nucleus at specific energy levels, or shells. An electron falling from a high energy level to a lower level will have
 A. absorbed a photon
 B. absorbed a neutrino
 C. emitted a photon
 D. emitted an electron
 E. emitted a neutrino


7. The diagram shows electron energy levels within a hydrogen atom. Of the 5 possible transitions listed below, the transition that will give rise to an emission spectral line of the shortest wavelength is
 A. from n=1 to n=2
 B. from n=2 to n=3
 C. from n=3 to n=2
 D. from n=3 to n=1
 E. from n=2 to n=1
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8. Which of these word equations summarises beta decay?
 A. neutronproton + beta particle + neutrino
 B. protonneutron + beta particle + neutrino
 C. neutronproton + beta particle + antineutrino
 D. protonneutron + beta particle + antineutrino + photon
 E. neutronproton + beta particle + neutrino + photon


9. When Uranium decays it emits an alpha particle, forming an isotope of Thorium. Which of the following decay equations is correct?
A. 
238 
U 

232 
Th 
+ 
2 
α 
92 
90 
2 
B. 
238 
U 

236 
Th 
+ 
2 
α 
92 
90 
2 
C. 
238 
U 

234 
Th 
+ 
4 
α 
92 
90 
2 
D. 
238 
U 

232 
Th 
+ 
4 
α 
92 
90 
2 
E. 
238 
U 

236 
Th 
+ 
2 
α 
92 
88 
4 


10. The graph below shows the decay of a sample of radioactive isotope.
Which of the following gives the half life and the activity remaining after 10 days? 


Half Life (days) 
Activity after 10 days (kBq) 
A. 
2 
0 
B. 
4 
0 
C. 
2 
2.5 
D. 
4 
5 
E. 
4 
2.5 



