Walther Bothe and Wilhelm Becker discovered a new kind of particle radiation in 1930. The particle was later determined to be a neutron. Bothe and Becker generated neutron radiation by
A. firing a beam of alpha particles at a beryllium target.
B. heating nuclei to extremely high temperatures to boil the neutrons off.
C. using an isotope that decays by emitting neutrons.
D. using electrons to attract protons away from the nucleus.
Answer: A
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An electron-volt is
A) the charge of one electron. B) the energy of one electron. C) the energy jump between the first and second energy levels of hydrogen. D) an amount of energy much smaller than a joule. E) an amount of energy much larger than a joule.
All the following statements about Venus are true. Which one offers evidence of a global repaving about a billion years ago?
A) Venus's largest features are three elevated regions that look somewhat like continents. B) Venus has many circular features, called coronae, which appear to be tectonic in origin. C) Venus appears to lack any water that could lubricate the flow of rock in its crust and mantle. D) Venus has relatively few impact craters and these craters are distributed fairly evenly over the entire planet.
If an electron is accelerated from rest through a potential difference of 100 V, what is its de Broglie wavelength?
A. 
B. 
C. 
D. 
E. 
Daytime low temperatures generally occur:
What will be an ideal response?