The EPR argument assumes which of the following to conclude that quantum mechanics is incomplete?
A. Quantons must have objectively real properties.
B. Superluminal communication is impossible.
C. Both assumptions.
D. Neither assumption.
C. Both assumptions.
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Suppose you live at latitude 40°N. Which of the following describes the path of the celestial equator through your sky?
A) It extends from due east on your horizon, to an altitude of 50° in the south, to due west on your horizon. B) It extends from due south on your horizon, to your zenith, to due north on your horizon. C) It extends from due east on your horizon, to an altitude of 40° in the south, to due west on your horizon. D) It extends from due east on your horizon, to an altitude of 40° in the north, to due west on your horizon.
A calculus book weighing 20 N rests on the floor of a classroom. The reaction to the force of the floor on the book is a force of
A. 9.8 m/s2 exerted by the Earth on the book. B. 2.04 kg exerted by the floor on the book. C. 20 N exerted by the book on the Earth. D. 0 N. E. 20 N exerted by the book on the floor.
A crystal diffracts a beam of electrons, like a grating, as they hit it perpendicular to its surface
The crystal spacing is 0.18 nm, and the first maximum scattering occurs at 80° relative to the normal to the surface. (e = 1.60 × 10-19 C, melectron = 9.11 × 10-13 kg, h = 6.626 × 10-34 J ? s) (a) What is the wavelength of the electrons? (b) What potential difference accelerated the electrons if they started from rest?
200 J of work is done in compressing a gas adiabatically. What is the change in internal energy of the gas?
A) zero B) 100 J C) 150 J D) 200 J E) There is not enough information to determine.