The number of photons per second passing a plane perpendicular to a collimated monochromatic (one frequency) beam of light transporting power P is directly proportional to
a. the wavelength of the light.
b. the frequency of the light.
c. the power of the beam.
d. all of the above.
e. only (a) and (c) above.
e
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Astronomers use _______________ to express distance from the Sun
Fill in the blank(s) with correct word
Significant Figures: In the difference A - B - C, A is accurate to 5 decimal places, B is accurate to 2 decimal places, and C is accurate to 3 decimal places. What is the correct number of decimal places in the difference?
A. 2 B. 3 C. 4 D. 5 E. 0
Astronomers have found that the expansion of the Universe is ________.
A. speeding up B. changing randomly C. constant D. slowing down
An electron and an alpha particle (a helium-4 nucleus) each have the same non-relativistic speed. Which has the greatest kinetic energy, and which has the shortest de Broglie wavelength?
a. the alpha particle, the alpha particle b. the alpha particle, the electron c. the electron, the alpha particle d. the electron, the electron