A sound level of 96 dB is how many times as intense as one of 90 dB?
4
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A capacitor is connected in series with a resistor and a switch. With the switch open, the capacitor is charged to 9.0 V. When the switch is closed, how long will it take for the voltage across the capacitor to drop to 6.0 V if the time constant of the circuit is 4.0 s?
A. 0.3 s B. 1.2 s C. 1.6 s D. 2.7 s E. 12 s
In Bragg's law, 2d sin ? = m?, how is ? measured?
a. from the reflecting crystal plane b. from the normal to the reflecting crystal plane c. from the direction of the incident beam d. from the normal to the direction of the incident beam
If a hydrogen atom, originally in its ground state of energy –13.6 eV, absorbs a photon of energy 22.0 eV, what is the resulting kinetic energy of the electron if the proton has negligible kinetic energy?
a. Such a photon cannot be absorbed in this case. b. 8.4 eV c. 2.4 eV d. 16.0 eV
Smart Rocks are considered for
A. geologic dating B. ballistic missile defense C. nuclear power D. solar power