When a certain metal is illuminated by light, photoelectrons are observed provided that the wavelength of the light is less than 669 nm
Which one of the following values is closest to the work function of this metal? (h = 6.626 × 10-34 J ? s, c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J)
A) 1.9 eV
B) 2.0 eV
C) 2.2 eV
D) 2.3 eV
Answer: A
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Suppose that we double the electrical power flowing into the filament of an incandescent bulb. By what factor will the most probable photon energy ? p increase?
A. 2 1/4 B. 21/3 C. 21/2 D. 2 E. 4 F. 8 T. 16
Answer the following statement(s) true (T) or false (F)
1. Fusion power is completely safe and has no radioactive waste disposal problem. 2. The fusion reactions used in thermonuclear bombs and fusion power experiments are exactly the same as those used in the sun.
A parallel plate capacitor of capacitance C0 has plates of area A with separation d between them. When it is connected to a battery of voltage V0, it has charge of magnitude Q0 on its plates. It is then disconnected from the battery and the plates are pulled apart to a separation 2d without discharging them. After the plates are 2d apart, the new capacitance and the potential difference between the plates are what?
A.
C0, 
V0B.
C0, V0C.
C0, 2V0D.
E.
What effect would powdering the solid have on the rate of dissolving the solid in a liquid?