Mesons consist of
A) quark-antiquark pairs.
B) triple gluons.
C) lepton-antilepton pairs.
D) lepton-quark pairs.
A
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Which planet hosts the Galilean moons?
A. Mars B. Saturn C. Jupiter D. Venus
If you face a cliff and give a shout, you will hear an echo. Are the sound waves of the echo inverted (A) or upright (B) compared to the waves of your original shout?
A. Inverted B. Upright
Starting from one oasis, a camel walks 25 km in a direction 30° south of west and then walks 30 km toward the north to a second oasis. What distance separates the two oases?
a. 15 km b. 48 km c. 28 km d. 53 km e. 55 km
Calculate the half-value thickness (in mm) of lead if it reduces the intensity of a beam of x-rays whose wavelength is 10 pm by a factor of two. (Assume the linear absorption coefficient of lead is 43 cm?1 for x-rays of wavelength 10 × 10^?12 m.)
a. 0.24 b. 0.20 c. 0.12 d. 0.16 e. 0.18