Two microcuries is
a. 200,000 Ci
b. 0.0002 Ci
c. 0.00002 Ci
d. 0.000002 Ci
e. 0.00000002 Ci
D
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NASA's Hubble Deep Field images and GOODS program observations have shown that ____
a. there are large patchy regions of the sky covered with galaxies separated by empty areas b. the entire sky is thickly covered with galaxies c. galaxies can be found in all directions, but are relatively rare d. galaxies are densely concentrated in a disk structure, which contains the Milky Way e. galaxies are concentrated in two opposite directions on the sky, with very few in between
In a converging lens, objects infinitely far away are focused
A) in front of the focal point. B) at the focal point. C) beyond the focal point.
A 10.0-kg box starts at rest and slides 3.90 m down a ramp inclined at an angle of 10° with the horizontal. If there is no friction between the ramp surface and crate, what is the velocity of the crate at the bottom of the ramp? (g = 9.8 m/s2)
a. 13.3 m/s b. 3.64 m/s c. 8.74 m/s d. 8.68 m/s e. 76.4 m/s
After light from a source passes through two slits, a first-order bright spot is seen on the wall at point P. Which distance is equal to the wavelength of the light?
a.
the extra distance one beam must travel
b.
the distance between beams as they leave the slit
c.
the distance of point P from the central point of the interference pattern
d.
the distance between slits