Friday, August 17, 2012

physics

What is the net static electric charge on a metal sphere having an excess of +3 elementary charges?



A. 4.7 x 10

B. 8.4 x 10

*C. 4.8 x 10

D. 8.7 x 1019 C



A hydrogen atom could have an electron energy level transition from n=2 to n=3 by absorbing a photon having an energy of?



*A. 1.89 eV

B. 2.04 eV

C. 2.25 eV

D. 2.87 eV



Two solid metal blocks are placed in an insulated container. If there is a net flow of heat between the blocks, they must have different?



*A. Initial temperatures

B. Specific Heat values

C. Melting points

D. Heats of fusion

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