Two lasers emit equal numbers of photons per second. If the first laser emits red light and the second emits blue light, the power radiated by the first is
A. equal to that emitted by the second.
B. greater than that emitted by the second.
C. less than that emitted by the second.
D. dependent on the time interval of the emission.
C. less than that emitted by the second.
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A ray of light in air enters a glass surface at right angles to the surface. What is the angle of incidence?
A) 0° B) 90° C) 180° D) 270° E) 360°
A change in the direction of a wave because of a change in the velocity of the wave is called ______________
Fill in the blank(s) with correct word
A nearsighted person cannot see objects beyond 80 cm from his eyes
Which one of the following combinations represents the correct focal length and the refractive power of the contact lenses that will enable him to comfortably see the distant objects clearly? A) +80 cm, -1.3 diopters B) -80 cm, +1.3 diopters C) +80 cm, +1.3 diopters D) -1.3 cm, +1.3 diopters E) -80 cm, -1.3 diopters
Two identical pith balls supported by insulating threads hang side by side and close together, as shown below.
One is positively charged; the other is neutral. We can conclude that
A. all field lines leaving the positively charged pith ball end on the neutral pith ball. B. some of the field lines leaving the positively charged pith ball end on the neutral pith ball. C. none of the field lines leaving the positively charged pith ball end on the neutral pith ball. D. positive charge is transferred along the field lines until both balls have equal charges. E. positive charge is transferred along the field lines until both balls hang along vertical lines.