The bright light at the center of a shadow cast by a penny
1.supports the hypothesis that light can be viewed as rays traveling in straight lines.
2.results from the re-reflection of the diffraction pattern cast by the penny.
3.is the result of the penny's shininess; it acts like a mirror providing a second source to create an interference pattern.
4.is the central maxima of the interference pattern caused by the diffraction effects around the penny.
4
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Lens-Maker Formula: A thin double-convex lens is intended to focus the image of an object onto a screen so that the image is life-sized on the screen. The lens has equal-magnitude radii of 83 cm and a refractive index of 1.6. (a) What is the distance d from the image to the screen?(b) What is the total distance L between the object and the image?
A. (a) d = 138 cm (b) L = 276 cm B. (a) d = 276 cm (b) L = 552 cm C. (a) d = 69 cm (b) L = 35 cm D. (a) d = -138 cm (b) L = -276 cm
The ____________________ of the Sun is composed of ionized gas and produces a continuous spectrum with a superimposed emission spectrum
Fill in the blank(s) with correct word
What is the range of timescales for star formation?
A) from 1 million years for the most massive stars up to 10 million years for the least massive stars B) from 1 million years for the most massive stars up to 100 million years for the least massive stars C) from 1 million years for the least massive stars up to 10 million years for the most massive stars D) from 1 million years for the least massive stars up to 100 million years for the most massive stars E) about 30 million years for all stars, whatever mass
The peak of the radiation curve of a blackbody moves upward toward higher intensity as its temperature increases
a. True b. False Indicate whether the statement is true or false