Suppose that you wish to construct a simple AC generator with an output of 12. V maximum when rotated at 60. Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is 100. cm2, how many turns are needed?
What will be an ideal response?
64. turns
Physics & Space Science
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Photons of energy 4.20 eV bombard a surface, which emits photoelectrons with kinetic energies for 0 to 1.80 eV. What is the threshold frequency for this surface?
a. 
b. 
c. 
d. 
e. 
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Characteristics of Waves: What is the frequency of a pressure wave of wavelength 2.5 m that is traveling at 1400 m/s?
A. 178 Hz B. 1.78 kHz C. 560 Hz D. 5.6 kHz
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An excited hydrogen atom is capable of emitting radiation of
A) a single frequency. B) three frequencies. C) many more than three frequencies.
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A car, a train, a bicycle, and a skateboard are traveling at the same speed. Which object has the greatest kinetic energy?
A) Car B) Bicycle C) Train D) Skateboard
Physics & Space Science