Why is hydrogen used as the target for proton collisions?
a. Because of its low cost and great abundance.
b. Because having only one electron in the way makes hydrogen's protons more accessible for collisions.
c. Because there are so many neutrons in the hydrogen nucleus.
d. Because hydrogen is the closest attainable thing to a target of pure protons.
e. Because hydrogen contains no protons.
d
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If the Universe were infinitely large, infinitely old, and static, then the CMB would appear uniform (i.e., homogenous and isotropic)
a. True b. False Indicate whether the statement is true or false
A window washer pulls herself upward using the bucket–pulley apparatus shown in the Fig.
(a) How hard must she pull downward to raise herself slowly at constant speed?
(b) If she increases this force by 15%, what will her acceleration be?
A ray of light is incident on the mid-point of a glass prism surface at an angle of 23.4° with the normal. For the glass, n = 1.60, and the prism apex angle is 51.8°. What is the angle of incidence at the glass-to-air surface on the side opposite where the ray exits the prism?
a. 39.5° b. 14.4° c. 37.4° d. 28.4° e. 42.7°
The universal gravitational constant G was first measured
A) before Newton's time. B) by Newton himself. C) after Newton's time.