Overall, what is our most accurate technique for measuring the distance to a nearby star?
A) radar ranging
B) stellar parallax
C) Hubble's law
D) white dwarf supernovae
B
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As an object is lowered into a deep hole in the surface of the Earth, which of the following must be assumed in regard to its potential energy?
a. increase b. decrease c. remain constant d. cannot tell from the information given
A pair of helium nuclei fused together produces
A) helium isotope. B) lithium. C) beryllium. D) carbon. E) iron.
A large plate carries a uniform charge density ? = 8.85 × 10-9 C/ m2. A pattern showing equipotential surfaces with a 5 V potential difference would appear as
A) a series of planes perpendicular to the plate, 1 cm apart. B) a series of lines perpendicular to the plate, 1 cm apart. C) a series of lines parallel to the plate, 1 cm apart. D) a series of circles of radius 1 cm, parallel to the plate. E) a series of planes parallel to the plate, 1 cm apart.
Consider two diffraction gratings with the same slit separation, the only difference being that one grating has 3 slits and the other 4 slits. If both gratings are illuminated with a beam of the same monochromatic light
A) the grating with 3 slits produces the greater separation between orders. B) the grating with 4 slits produces the greater separation between orders. C) both gratings produce the same separation between orders. D) both gratings produce the same separation between orders, but the orders are better defined with the 4-slit grating.