A stopping potential of 3.2 V is needed for radiation whose wavelength is 200 nm. What is the work function (in eV) of the material?
a. 4.0
b. 3.0
c. 5.0
d. 6.0
e. 2.0
b
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A plane parallel plate capacitor has plates of 10 cm2 area that are 1.0 mm apart. At an instant when charge is being accumulated on the plates at a rate of 12 nC/s, the displacement current between the plates is
a. 1.06 × 10^?16 A. b. 1.2 × 10^?8 A. c. 8.85 × 10^?9 A. d. 1.00 A. e. 1.36 A.
Projectile Motion: You throw a rock horizontally off a cliff with a speed of 20 m/s and no significant air resistance. After 2.0 s, the magnitude of the velocity of the rock is closest to
A. 28 m/s B. 20 m/s C. 40 m/s D. 37 m/s
The Great Wall is a huge sheet of galaxies that stretches for over 100 Mpc
Indicate whether the statement is true or false
Evidence for a very early "super rapid" inflation of the universe is that the 3-K radiation from opposite sides of the sky (i.e., 180 degrees or about 28 billion light years apart) is of nearly ___________ intensity. Time for light to travel this distance is ___________ the age of the universe in years
a. equal; greater than b. unequal; greater than c. equal; less than d. unequal; less than