When a photoelectric surface is illuminated with light of wavelength 437 nm, the stopping potential is measured to be 1.67 V
(1 eV = 1.60 × 10-19 J, e = 1.60 × 10-19 C, melectron = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s)
(a) What is the work function of the metal, in eV?
(b) What is the maximum speed of the ejected electrons?
(a) 1.17 eV (b) 7.66 × 105 m/s
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A block slides down a frictionless inclined ramp
If the ramp angle is 17.0° above the horizontal and the length of the surface of the ramp is find the speed of the block as it reaches the bottom of the ramp, assuming it started sliding from rest at the top. Also assume no air resistance. A) 10.7 m/s B) 114 m/s C) 7.57 m/s D) 19.6 m/s
In order for a satellite to be geosynchronous, its orbit must:
a. go over the North and South Poles. c. be over a single longitude. b. be over the equator. d. emit television signals.
. 
The multicolored ring in the image above of Earth is a/an ___________.
a. impact site under the water, falsely colored.
b. tornado
c. hurricane
d. aurora
How is quantum tunneling important to our existence here on Earth?
A) It plays a crucial role in nuclear fusion in the Sun, so that our Sun would not shine brightly without it. B) It explains how neutron stars are able to stay stable rather than collapsing under their strong gravity. C) It explains why electrons in atoms gradually fill different energy levels, thus making chemistry possible. D) It is important to understanding the law of conservation of energy.