C. D. Anderson
A) discovered the positron using a cloud chamber (1932).
B) was the first to produce diffraction patterns of electrons in crystals (1927).
C) was the first to produce X-ray-like diffraction patterns of electrons passing through thin metal foil (1927).
D) predicted the positron from relativistic quantum mechanics (1928).
E) set the limits on the probability of measurement accuracy (1927).
A
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Of all the planets, only ________ has surface features easily seen from Earth with ground-based telescopes
Fill in the blank(s) with correct word
Willis thinks over the discussion of the second part of the first experiment described on pages 30-31 . He is interested in the equality of the force he exerts on the clone and the one the clone exerts on him
Later he tells his girlfriend Sheena "It may be right in that case, because both people had the same mass. It's wrong if the masses are different. If I met the Hulk and he pushed me, it would be with a greater force than I could use to push him back." Discuss this reasoning.
Match the words at the left to the correct blanks in the sentences at right. Use each choice only once.
A. A camera is an example of an instrument used for _________observations. B. _________ refers to telescopic observations in which we separate an object's light so we can measure its intensity at different wavelengths. C. If we want to confirm that a star's brightness alternately dims and brightens, we need __________ observations of the star. D. The familiar twinkling of the stars is caused by _____________, which also blurs telescopic images. E. Human civilization is responsible for what astronomers call ____________.
If an object is located 20 m to the left of the origin at 1:00 PM, and later the object is located 30 m to the right of the origin at 2:00 PM, then the displacement from 1:00 PM to 2:00 PM is
A. 50 m to the right. B. 30 m to the right. C. 25 m to the right. D. 20 m to the left. E. 10 m to the left.