A mass spectrometer needs
A) colinear magnetic and electric fields.
B) perpendicular magnetic and electric fields.
C) only a magnetic field.
D) only an electric field.
E) a perpendicular gravitational field.
B
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The absorption lines in the visible portion of the spectrum of a star that are produced by hydrogen are from the
a. Lyman series. b. Balmer series. c. Paschen series. d. isotopes of hydrogen. e. ions of hydrogen.
The identities of dark energy and dark matter are
A) unknown at this time. B) subjects of intense astronomical interest. C) both of these D) neither of these
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.
When an unstable nucleus decays by emitting an alpha particle, the atomic mass number A of the nucleus
A) increases by 4. B) increases by 2. C) decreases by 2. D) decreases by 4. E) remains unchanged.