An alpha particle is emitted from a radioactive source with an energy of 5 MeV. How fast is it moving (in m/s)? (m = 4.002 603 u, 1 u = 1.66 × 10^-27 kg.)
a. 2.4 × 10^7
b. 1.6 × 10^7
c. 3.7 × 10^7
d. 4.6 × 10^7
e. 2.1 × 10^7
B
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If a star has a parallax of 0.05", then its distance in light years is about:
A) 6.4 light years. B) 12.7 light years. C) 20 light years. D) 65 light years. E) 100 light years.
How can an electron be ejected from a nucleus in beta decay if it wasn't in the nucleus to begin with?
a. The electron doesn't come from the nucleus—it comes from an orbit circling the nucleus. b. A neutron in the nucleus turns into a proton, electron, and a neutrino. c. A proton in the nucleus turns into a neutron, electron, and a neutrino. d. none of the above
Tuning forks #1, #2, and #3 each have slightly different frequencies.When #1 and #2 are sounded together, a beat frequency of 3 Hz results. When #2 and #3 are sounded together, a beat frequency of 5 Hz results. If the frequency of #1 is 100 Hz, which of the following cannot be the frequency of #3?
a. 92 Hz b. 95 Hz c. 98 Hz d. 102 Hz e. 108 Hz
If a proton and an electron have the same de Broglie wavelengths, which one is moving faster?
A) the electron B) the proton C) They both have the same speed.