A neutron?
A. A
B. B
C. C
D. D
E. zero
F. Other
G. AA
H. BB
I. CC
J. DD
E. zero
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What explains the metallicity difference between population I and population II stars?
A. Population I stars formed in regions of the MWG where heavy elements were plentiful. Population II stars formed in regions of the MWG where heavy elements were scarce. As a result of their location of formation, the two populations have differing metallicities. B. Population II stars are older than population II star and have therefore had a much longer time to produced heavy elements. C. Population II stars formed when the abundance of elements heavier than hydrogen and helium was low. Population I stars formed later, after mass lost by dying members of the first generations of stars had enriched the interstellar medium with elements heavier than hydrogen and helium. D. Population I stars are of a spectral type like our Sun or possibly cooler. Population II stars are of a spectral type that is hotter than our Sun. Heavier elements form in the hotter, more massive stars, causing the metallicity difference between the two populations.
Usually one can touch the terminals of a battery (e.g., 1.5 volts) with no dire consequences
Why do hospital intensive care rooms go to great effort and expense to attach "ground wires" to equipment in order to guard against the presence of low potentials? (i.e., why are low voltages hazardous in hospitals?)
Planets with larger orbital radii have longer orbital periods because they both have a longer distance to travel in each orbit and move more slowly
Indicate whether the statement is true or false
A charged particle moves in a region of uniform magnetic field along a helical path (radius = 5.0 cm, pitch = 12 cm, period = 5.0 ms). What is the speed of this particle as it moves along this path?
a. 67 m/s b. 26 m/s c. 63 m/s d. 24 m/s e. 87 m/s