Increasing the brightness of a beam of light without changing its color will increase
A) the number of photons per second traveling in the beam.
B) the energy of each photon.
C) the speed of the photons.
D) the frequency of the light.
E) the wavelength of the photons.
A
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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? (c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T • m/A, ?0 = 8.85 × 10-12 C2/N • m2)
A) 490 V/m B) 840 V/m C) 65 V/m D) 120 V/m E) 22 V/m
What part of the Sun's aging process will destroy Earth itself?
a. the fusion of hydrogen in the core b. an increase in luminosity as the core becomes helium-enriched c. the expansion of the outer layers of the Sun as a red giant d. the supernova explosion caused by the collapse of the iron core e. hydrogen detonation on the white dwarf remnant
A BTU has more energy than a calorie.
Indicate whether the statement is true or false.
The planets with known rings are Saturn, Neptune, ______________, and Jupiter
Fill in the blank(s) with correct word