A quantum number for a quark is
a. strangeness.
b. beauty.
c. charm.
d. truth.
e. all of the above.
e
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Choose the correct word(s) that make the statement true. Say you live in the southern hemisphere and the date is March 20 . For you, summer is ending. Therefore, the March 20th date is the first day of (spring, summer, fall, winter), an event called the (vernal equinox, summer solstice, autumnal equinox, winter solstice)
What will be an ideal response?
How would the passengers on the spaceship view our clocks?
A) Time is the same for everyone. B) Our clocks are going fast. C) Our clocks are going slow. D) Our clocks are going at the same rate as theirs. E) They can't see our clocks, but we can see theirs.
Two beams of coherent light travel different paths arriving at point P. If the maximum constructive interference is to occur at point P, what should be the phase difference between the two waves?
A) The phase difference between the two waves is ?/4. B) The phase difference between the two waves is ?/2. C) The phase difference between the two waves is ?. D) The phase difference between the two waves is 2?. E) The phase difference between the two waves is 5?/2.
What process best explains the observed pattern of abundances of elements with atomic numbers between 6 and 20?
A) radioactive decay of nuclei with odd numbers of protons B) fusion reactions with hydrogen nuclei C) fusion reactions with helium nuclei D) fusion reactions with neutrons