A laser with a power of 1.0 mW has a beam radius of 1.0 mm. What is the peak value of the electric field in that beam?
A)
490 V/m
B)
840 V/m
C)
65 V/m
D)
120 V/m
E)
22 V/m
A
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According to the general theory of relativity, how fast to gravitational waves move through space?
A) the speed of light B) the speed of gravity, which is slower than light C) the speed of gravity, which is faster than light D) Gravitational waves can be felt instantaneously over any distance of space. E) the speed of sound
A heater is rated at 1200 watts for a 120-volt source.The current drawn by the heater is 10 amperes
a. True b. False Indicate whether the statement is true or false
A ray of light is incident on a pane of common window glass at an angle of 35° to the normal. The angle of the reflected ray with respect to the normal is
1) 35° 2) 55° 3) 90° 4) 20° and the refracted ray within the glass may be at an angle of 5) 35°. 6) 55°. 7) 22°. 8) 75°.
Atomic number refers to the number of
A) protons in the nucleus. B) neutrons in the nucleus. C) nucleons in the nucleus.