EM waves tend to be scattered the most by an object that is

A. conducting.
B. about the same size as the wave.
C. magnetic.
D. reflective.
E. a liquid.


Answer: B

Physics & Space Science

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1.4 2.8 3.16 4.64

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A change in the direction of a wave when the wave finds an obstacle or an edge.

a) Refraction b) Standing wave c) Reflection d) Diffraction

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A kid slides down an icy (frictionless) hill starting from rest. At the top his gravitational potential energy is 500 J. He slides part way down the hill to a point where his gravitational potential energy is 200 J. His kinetic energy at that point will be

a. 200 J b. 300 J c. some unknown value between 0 and 500 J d. none of the above

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It is unrealistic to expect to succeed at a randomized controlled trial that requires people to alter their behavior over a significant period of time.

a. true b. false

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