An engineer designed a transformer to convert 120 V (rms) to 6.0 V (rms). The number of turns in the primary is 540, and the secondary current is 610 mA at an output voltage of 6.0 V (rms). How many turns are in the secondary?
a. 90
b. 27
c. 5
d. 3 240
b
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Photoelectric Effect: A blue laser beam is incident on a metallic surface, causing electrons to be ejected from the metal. If the frequency of the laser beam is increased while the intensity of the beam is held fixed,
A. the rate of ejected electrons will decrease and their maximum kinetic energy will increase. B. the rate of ejected electrons will remain the same but their maximum kinetic energy will increase. C. the rate of ejected electrons will increase and their maximum kinetic energy will increase. D. the rate of ejected electrons will remain the same but their maximum kinetic energy will decrease.
If atmospheric pressure increases by an amount ?p, which of the following statements about the pressure in a lake is true? (There could be more than one correct choice.)
A) The absolute (total) pressure does not change. B) The gauge pressure increases by ?p. C) The absolute (total) pressure increases by ?p. D) The absolute (total) pressure increases, but by an amount less than ?p. E) The gauge pressure does not change.
A radar pulse returns 3.0 × 10^-4 s after it was sent out and reflected by an object. What is the separation distance of the radar source and the object?
Nonmetals produce negatively charged ions,
which are referred to as a) lone pairs. b) cations. c) polar ions. d) anions.