What is the cause of refraction of a wave traveling from one medium to another?
a. There is a frequency change due to the change in the medium
b. There is a speed change due to the change in the medium.
c. There is a change in wave amplitude due to the change in the medium.
d. None of the above are associated with refraction.
b
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You look at yourself in a plane mirror. If you move away from the mirror and look at yourself again, you now see
a. more of yourself. b. less of yourself. c. the same amount of yourself. d. a larger image of yourself. e. a smaller image of yourself.
Suppose that the Department of Energy develops a new reversible engine that has a coefficient of performance (COP) of 4.0
when operated as a refrigerator and a COP of 5.0 when operated as a heat pump. What is its thermal efficiency when operated as a heat engine doing work? A) 20% B) 10% C) 45% D) 80% E) 25%
Contrast the appearance of the H-R diagrams of a young open and old globular cluster
What will be an ideal response?
The process of changing the shape of the lens, and hence adjusting its focal length, is referred as accommodation
Indicate whether the statement is true or false