When light in air strikes the flat surface of a certain glass at 31.2° with the normal, the reflected ray is 100 percent polarized. What is the critical angle for the air-glass interface of this glass?
A) 52.7° B) 21.4° C) 68.6° D) 58.8° E) 37.3°
E
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Two one-liter containers each contain 10 moles of a gas. The temperature is the same in both containers. Container A holds helium (molecular mass = 4 u), and Container B holds oxygen (molecular mass = 32 u). Which container has the higher pressure and by what factor?
a. Container A has 4 times the pressure of Container B. b. Container A has 8 times the pressure of Container B. c. Both containers have the same pressure. d. More information is needed to answer this question.
Why do disks form around young stars?
A) The surrounding gas can only approach the star from a single direction. B) Collisions between gas particles flatten the rotating gas cloud. C) The rotation of the cloud causes gas to be spun outward from the central star. D) Intense winds from nearby massive stars flatten the gas cloud.
The symbol indicating the mass number of a nucleus is A
a. True b. False Indicate whether the statement is true or false
Why are astronomers interested in building observatories capable of detecting neutrinos, cosmic rays, and gravitational waves?
A) These things are not forms of light, and therefore can provide different types of information than light about objects that emit them. B) These things are the highest energy forms of light, even more energetic than gamma rays, and therefore can tell us about explosive processes in the universe. C) These things should in principle be much easier to detect than light, which means we could build these observatories cheaply. D) These things are emitted from the same objects that emit x-rays, but unlike x-rays they can be detected with observatories on the ground.