Which of the patterns shown below would appear on a screen when monochromatic light first passes through a narrow slit for which a = ? and then strikes the screen? Note that the darkest area in each illustration represents the brightest area on the screen
a.
b.
d
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Which general pattern holds for various excited states in standing waves on a rope or string fixed at both ends?
A. Guitars and violins have antinodes only in even numbers: 0, 2, 4, and so on B. Where the nodes are, you also find two antinodes C. More antinodes means shorter wavelengths D. Standing waves involve the interference of waves traveling in the same direction
The explosion in a cannon exerts an average force of 30,000 N for 2.00 meters. The velocity of a 2.00 kg projectile shot from the cannon is
A. 198 m/s. B. 245 m/s. C. 302 m/s. D. 354 m/s. E. 412 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.
The average distance from Earth to the sun is
a. 1 ly b. 1 million km c. 1 million miles d. 1 billion km e. 1 AU