Active galaxies are thought to have _______ in their centers
a. accretion disks
b. massive black holes
c. accretion disks and massive black holes
d. the Local Group
e. a cluster of galaxies
c
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Nuclear Binding Energy: A beryllium-8 nucleus at rest undergoes double alpha decay as follows:
The known atomic masses are:
What is the kinetic energy of each departing alpha particle? (1 u = 931.5 MeV/c2)
A. 46 keV B. 65 keV C. 92 keV D. 130 keV E. 180 keV
We live in the ______________ epoch
Fill in the blank(s) with correct word
An electron of mass 9.11 × 10^-31 kg moves with a speed of 0.800c. What is its momentum? (c = 3.00 × 10^8 m/s)
a. 3.64 × 10^-22 kg×m/s c. 6.03 × 10^-22 kg×m/s b. 2.05 × 10^-22 kg×m/s d. 1.34 × 10^-22 kg×m/s
If you double the amplitude of a harmonic oscillator, the oscillator’s period
A. Decreases by a factor of 2. B. Decreases by a factor of . C. Does not change. D. Increases by a factor of . E. Increases by a factor of 2. F. Changes by some other factor (specify).