If a sound level increases by 40 dB, the intensity increases by a factor of ______________
a. one hundred thousand
b. ten thousand
c. one thousand
d. one million
b
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While on the main sequence a star's primary energy source comes from
a. nuclear fusion. b. nuclear fission. c. gravitational potential energy. d. magnetic fields.
The contact angle for a water droplet on wax is 112°. Assume that the surface tension for wax 0.023 N/m. What is the value of the interfacial tension between water and wax at 25°C?
What will be an ideal response?
Series Resonance: An ac circuit has a 100-? resistor in series with a 4.9-?F capacitor and a 700-mH inductor. At what frequency does the circuit act like a pure resistance?
A. 0.29 MHz B. 1.9 MHz C. 12 MHz D. 0.54 kHz E. 86 Hz
The isotope 14C cannot be used in dating old samples of which of the following?
a. a bronze implement from a cave b. charcoal from a fire c. a bone buried in mud d. All of these choices can be dated using 14C.