According to Einstein, what is true of the stopping potential for a photoelectric current as the wavelength of incident light becomes shorter?
a. increases
b. decreases
c. remains constant
d. stopping potential is directly proportional to wavelength
a
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Which of the following is an example of a star?
A) Venus B) Pluto C) The Sun D) The Moon
A uniform electric field 
is present in the region between the infinite parallel planes of charge A and B, and a uniform electric field 
is present in the region between the infinite parallel planes of charge B and C. When the planes are vertical and the fields are both non-zero,
A.
and are both directed to the right.B.
and are both directed to the left.C.
points to the right and to the left.D.
points to the left and to the right.E.
A car traveling at 100 km/h strikes an unfortunate bug that splatters on the windshield. The force of impact is greater on the
A) bug. B) car. C) same for both
Molecular Speeds: A 0.50 m3 gas tank holds 3.0 moles of ideal diatomic nitrogen gas at a temperature of 350 K. The atomic mass of nitrogen is 14.0 g/mol. What is the rms speed of the molecules? (The Boltzmann constant is 1.38 × 10-23 J/K, NA = 6.022 × 1023 molecules/mol.)
A. 560 B. 790 C. 390 D. 21 E. 97