A 14-mm tall postage stamp is 4.0 mm from a converging lens. If the image of the stamp is 4.0 mm tall, how far is it from the lens?
A) 14 mm
B) 8.7 mm
C) 1.4 mm
D) 1.1 mm
D
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A convex mirror with a focal length of -20 cm forms an image 12 cm behind the surface. If the object height is 1.2 cm what is the image height?
a. 0.30 cm c. 0.94 cm b. 0.48 cm d. 3.0 cm
The ground state of hydrogen has two closely-spaced energy levels, where oneelectron is spinning up and the other is spinning down. This energy transition corresponds to releasing excess energy as a photon at what wavelength?
a. 21 centimeters b. 21 millimeters c. 21 meters d. 22.2 centimeters e. 22.2 millimeters
Why does a golf ball hit on the Moon travel farther than one hit on Earth? (Neglect air resistance and bad golfers.)
A. The Moon is physically smaller than Earth, so the golf ball only looks like it travels farther. B. The mass of the ball is lower on the Moon, so it is accelerated more easily there. C. The surface gravity is lower on the Moon, so the golf club can be accelerated more easily there. D. The surface gravity is lower on the Moon, so the acceleration of gravity is lower.
Observationally, how can we tell the difference between a white-dwarf supernova and a massive-star supernova?
A) A massive-star supernova is brighter than a white-dwarf supernova. B) A massive-star supernova happens only once, while a white-dwarf supernova can repeat periodically. C) The light of a white-dwarf supernova fades steadily, while the light of a massive-star supernova continues to brighten for many weeks. D) The spectrum of a massive-star supernova shows prominent hydrogen lines, while the spectrum of a white-dwarf supernova does not. E) We cannot yet tell the difference between a massive-star supernova and a white-dwarf supernova.