A metallic sheet has a large number of parallel slits, 5.0 mm wide and 20 cm apart. This sheet is used as a grating for microwaves
A wide parallel beam of microwaves is incident normally on the sheet. If the microwave wavelength is 6.0 cm, what is the largest angle from the normal, at which an intensity maximum occurs?
A) 64°
B) 69°
C) 74°
D) 79°
E) 84°
A
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The center of our galaxy is believed to be occupied by the radio source known as ____________________
Fill in the blank(s) with correct word
The density of white dwarf stars is about a million times that of the Sun
Indicate whether the statement is true or false
Free Fall: Abby throws a ball straight up and times it. She sees that the ball goes by the top of a flagpole after 0.50 s and reaches the level of the top of the pole after a total elapsed time of 4.1 s. What was the speed of the ball at launch? Neglect air resistance.
A. 11 m/s B. 23 m/s C. 34 m/s D. 45 m/s E. 48 m/s
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.