A total solar eclipse occurs for people in the Sun's
A) umbra.
B) penumbra.
C) none of these
Answer: A
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If a barometer were to be made using water as the liquid instead of mercury, the length of the barometer tube for water would be ________ than the tube for a standard mercury barometer.
What will be an ideal response?
A ball starting from rest at the top of an inclined plane gains a speed of 2 m/s for each second it rolls. What is its acceleration down the incline?
A) 0.5 m/s2 B) 1 m/s2 C) 2 m/s2 D) 4 m/s2
The sources of X-rays are
A) electron clouds. B) the atomic nucleus. C) both of these D) neither of these
A slit of variable width illuminated by light of wavelength ? is widened until the first order diffraction minimum moves out to a distance infinitely far away from the brightest location in the central maximum. In terms of the wavelength, the width of the slit is then
A.
B.
.C.
D.
.E.