The symbol indicating the mass number of a nucleus is __________
Fill in the blank(s) with correct word
A
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In an ac circuit, the current in a capacitor
A. leads the voltage by 90
B. lags the voltage by 90
C. is in phase with the voltage.
D. leads the voltage by 
radians.
E. lags the voltage by 
radians.
How is radioactive dating used to determine the age of an object?
a. Both the amounts of radioactive and decay material are measured. Using these with the radioactive material's half-life, the age can be estimated. b. The amount of radioactive material is measured. Using this with the radioactive material's half-life, the age can be estimated. c. The amount of decay material is measured. Using this with the radioactive material's half-life, the age can be estimated. d. The amount of heat generated by radioactive dating is measured to determine age.
Einstein's equation E = mc2 states that when a particle loses energy, the result is an increase in mass of the particle
a. True b. False Indicate whether the statement is true or false
A situation known as "population inversion" is needed for lasing action. What does "population inversion" mean?
A. Electrons are in the -1/2 state. B. Excited atoms must be at the top of the laser tube. C. Excited atoms must be at the bottom of the laser tube. D. The number of excited states that are to emit photons are in greater number than the lower states at which the transition is ending. E. The number of lower states are in greater number than the upper states participating in the lasing action.