What is an atom made of?
A.) Photons and electrons.
B.) Photons, gravitons, and strange quarks.
C.) Protons, neutrons, and electrons.
D.) Positrons and electrons.
E.) Neutrons, photons, and W bosons.
Ans: C.) Protons, neutrons, and electrons.
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A soap film is being viewed in white light. As the film becomes very much thinner than the wavelength of blue light, the film
A) appears black because it reflects no visible light. B) appears blue since all other colors are transmitted. C) appears white because it reflects all wavelengths of visible light. D) appears red since all other colors are transmitted.
At an instant when a particle of mass 80 g has a velocity of 25 m/s in the positive y direction, a 75-g particle has a velocity of 20 m/s in the positive x direction. What is the speed of the center of mass of this two-particle system at this instant?
A. 16 m/s B. 45 m/s C. 23 m/s D. 20 m/s E. 36 m/s
From the Earth, the Earthlings see the Enterprise approaching from the west at 0.800c and the Klingons approaching from the east at 0.900c
What speed, in terms of the speed of light, does the crew of the Enterprise measure for the Klingon ship?
In a Young's experiment, the paths from the slits to a point on the screen differ in length, causing constructive interference at the point. Which of the following path differences would cause this constructive interference?
a. 5l/2 c. 3l/4 b. 3l d. None of these choices.