When a shell of hydrogen accretes onto a white dwarf from a close companion, a(n) ________ explosion violently blows off a fraction of a solar mass
Fill in the blank(s) with correct word
nova
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An astronomer claims to have measured the spectrum of a nearby galaxy and finds that the spectral lines are slightly blueshifted. This result is unreliable because it violates Hubble's law.
Answer the following statement true (T) or false (F)
A neutron has a mass of 1.67 × 10^-27 kg. Its de Broglie wavelength is 1.4 × 10^-10 m. What temperature would it correspond to if we had a monatomic gas having the same average kinetic energy (in °C)?
a. 273 b. 25 c. 36 d. 309 e. 51
Because of the period-luminosity relation for Cepheids and RR Lyrae variable stars, astronomers are able to _____
a. determine the relationship between the period of pulses and luminosity b. measure the mass of a star c. calculate a star's diameter d. determine the chemical composition of a Type I Cepheid e. narrow their study to eclipsing binary stars only
A 2.2 k 
resistor and a 2.0 
F capacitor are in series in an ac circuit. The rms voltages across each are equal. What is the frequency?
A. 23 Hz B. 15 Hz C. 72 Hz D. 36 Hz E. There is insufficient information to solve.