What is a curie?
a. The unit of speed of radioactive decay.
b. The same unit as an alpha particle or a helium nucleus.
c. The half-life of an isotope expressed as a rate instead of a time (i.e., "per second" instead of "seconds").
d. The unit that measures the number of decays in each unit of time that are occurring in a sample.
e. The unit of momentum of a radioactive particle.
d
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Very little hydrogen is found in the spectrum of a(n) ________ supernova
Fill in the blank(s) with correct word
What is the magnitude of the free-fall acceleration at a point that is a distance 2R above the surface of the Earth, where R is the radius of the Earth?
a. 4.8 m/s2 b. 1.1 m/s2 c. 3.3 m/s2 d. 2.5 m/s2 e. 6.5 m/s2
The ionosphere
a. reflects all EM waves b. reflects high frequency radio waves c. reflects low frequency radio waves d. is responsible for the greenhouse effect e. absorbs ultraviolet light in sunlight
Energy and Mass: How many MeV of energy is released during a reaction in which 1.67 × 10-25 kg of material is converted to energy? (c = 3.0 × 108 m/s, 1 eV = 1.67 × 10-19 J)
A. 5.0 × 10-14 MeV B. 4.1 × 10-7 MeV C. 3.1 × 10-4 MeV D. 9.4 × 104 MeV