A statue that is 10.4 cm tall is placed 4.8 cm in front of a concave lens. The image is 4.0 cm from the lens. How tall is the image?
A) 13 cm
B) 8.7 cm
C) 5.4 cm
D) 1.8 cm
B
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The wavelength of the red-pink line emitted by a laboratory sample of excited hydrogen is 656 nm. Taking a spectrum of a glowing nebula, you find that the same red-pink line of hydrogen appears at 662 nm. You conclude that the nebula
A. is moving away from us at about 1% the speed of light. B. is 1% hotter than hydrogen in the laboratory sample. C. is moving toward us at about 1% the speed of light. D. is 1% cooler than hydrogen in the laboratory sample.
Microscopes are inherently limited by the wavelength of the light used. How much smaller (in order of magnitude) can we "see" using an electron microscope whose electrons have been accelerated through a potential difference of 50000 V than using red light (500 nm)?
a. 3 b. 4 c. 5 d. 6 e. 14
An astronaut is traveling at a high rate of speed from the Earth to a distant star system. Observers here on Earth note the relativistic effect that the astronaut's clocks run slow. What relativistic effect, if any, does the astronaut observe?
a. Her pulse rate slows. b. The distance from the Earth to the star system has decreased. c. Her clocks run faster. d. There is no relativistic effect to be observed by the astronaut since she is the one doing the moving.
A small bead slides without friction along the wire shown. It begins at A and slides by gravity past B, which doesn't touch the rest of the wire. The potential energy of the bead is greatest at point
1) A, 2) B, 3) C, 4) D, 5) E, and the bead has its maximum momentum at point 6) A. 7) B. 8) C. 9) D. 10) E.