Photoelectric Effect Using Stopping Potential: When light of wavelength 350 nm is incident on a metal surface, the stopping potential of the photoelectrons is measured to be 0.500 V. What is the work function of this metal? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A. 0.500 eV
B. 3.05 eV
C. 3.54 eV
D. 4.12 eV
Answer: B
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Size of the Nucleus: What is the approximate nuclear radius of an isotope of sodium with 11 protons and 12 neutrons?
Fill in the blank(s) with the appropriate word(s).
The iron we commonly find in our surroundings came from:
A) the iron core of a massive star which exploded as a type I supernova. B) planetary nebulae. C) jets ejected by a rapidly spinning pulsar. D) material ejected by a nova explosion. E) decay of nickel 56 and cobalt 56 in a supernova remnant.
The linear hypothesis is
A. known to be true B. widely used even though it is not proven C. known to be false D. generally ignored in analysis of radiation deaths
How many electrons does it take to make one coulomb of negative charge?
a. 
b. 
c. 
d. 
e. 