The index of refraction for a certain material is 1.399 for red light and 1.432 for blue light. Find the angle separating the two refracted colors if the:
(a) angle of incidence is 30°.
(b) angle of incidence is 60°.
(a) 0.50°
(b) 1.04°
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The contact force F between the two cylinders in Problem 3.3 may be expressed in terms of load variable W as:
(A) 1.82W (B) 2.5W (C) 2.1W (D) 1.52W
How long did it take for oxygen to build up in the Earth's atmosphere to its present levels?
A) at least 542 million years B) at least 360 million years C) at least 2 billion years D) at least 3.5 billion years
The half-life of cobalt-60 is 5.3 years, while that of strontium-90 is about 29 years. Suppose you have samples of both isotopes, and that they initially have the same activity (number of decays per second)
What must be true of the numbers of cobalt-60 and strontium-90 nuclei in these samples? A) There are more strontium-90 than cobalt-60 nuclei. B) There are equal numbers of cobalt-60 and strontium-90 nuclei. C) There are more cobalt-60 than strontium-90 nuclei. D) It is not possible to compare numbers of nuclei without knowing the masses of the samples.
All waves transfer ______________
Fill in the blank(s) with correct word