Which of the following persons used the ideas of quantum mechanics to describe why the spectral classification scheme is in order of decreasing temperature?
A) Annie Jump Cannon
B) Williamina Fleming
C) Cecilia Payne-Gaposchkin
D) Henry Draper
E) Edward Pickering
C
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Why is the recoil less if a person holds a gun tightly against the shoulder?
A. The recoil is not less. Since momentum is conserved, the recoil is the same whether or not the gun is held tightly B. Your mass becomes part of the system, and since momentum is conserved, the velocity of the gun/person system is reduced C. If the gun is held tightly the bullet doesn’t travel as fast so conservation of momentum leads to a smaller recoil velocity of the gun.
Quarks, originally isolated in cosmic ray showers, are elementary particles possessing electric charge equal to 1/3 or 2/3 the magnitude of the charge of a proton
Indicate whether the statement is true or false
Chemically, helium is
A) an isotope. B) an element. C) a mixture. D) a solid. E) a compound.
A visual defect wherein a person can see distant objects clearly but not nearby objects is called
a. dispersion. b. destructive interference. c. farsightedness. d. nearsightedness.