Which of the following has the largest albedo?
a. Water
b. Polar ice
c. Fresh snow
d. Dry sand
e. Dark soil
c
You might also like to view...
Two long straight wires carry currents perpendicular to the xy plane. One carries a current of 50 A and passes through the point x = 5.0 cm on the x axis. The second wire has a current of 80 A and passes through the point y = 4.0 cm on the y axis. What is the magnitude of the resulting magnetic field at the origin?
A. 200 ?T B. 600 ?T C. 450 ?T D. 300 ?T E. 400 ?T
A radioactive material initially is observed to have an activity of 1000 decays/sec. If nine hours later it is observed to have an activity of 125 decays/s, what is its half-life?
a. 1/2 hour c. 3 hours b. 8 hours d. 1 hour
In a physics demonstration, two rubber balls are dropped down a tube towards the ground, with the lighter ball behind, and not quite in contact with, the heavier ball
The heavier ball collides with the ground and bounces, then collides with the still descending lighter ball. Assume that all the collisions are elastic. In one such demonstration, the heavier ball has a mass of 500 grams, the lighter one a mass of 100 grams, and they are released 1.00 m above the ground. How high does the lighter ball rise after the two collisions? A) 5.44 m B) 10.3 m C) 2.95 m D) 5.89 m E) 1.00 m
Which design is subject to chromatic aberration?
A) refractor B) prime focus reflector C) Newtonian reflector D) Cassegrain reflector E) Gregorian reflector