Light spreads out when it passes through a narrow slit because of __________
Fill in the blank(s) with correct word
diffraction
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Fundamental Forces: Which of the following statements is not true of the strong nuclear force?
A. The nuclear force has a short range, of the order of nuclear dimensions. B. For two protons that are very close together, the nuclear force and the electric force have about the same magnitudes. C. The nuclear force does not depend on charge. D. A nucleon in a large nucleus interacts via the nuclear force only with nearby nucleons, not with ones far away in the nucleus. E. The nuclear force affects both neutrons and protons.
Two objects, one of mass m and the other of mass 2 m, are dropped from the top of a building. When they hit the ground:
A) both will have the same kinetic energy. B) the heavier one will have twice the kinetic energy of the lighter one. C) the heavier one will have four times the kinetic energy of the lighter one. D) the heavier one will have half the kinetic energy of the lighter one. E) the heavier one will have one-fourth the kinetic energy of the lighter one.
What do the radio pulses within the anticoded message sent in 1974 represent?
a. all the letters in the alphabet b. dots and dashes, like Morse code c. binary numbers, ones and zeroes d. Music, notes and measures e. the numbers one through ten
A metal bar is 20 cm long and has a rectangular cross-section measuring 1.0 cm × 2.0 cm. What is the voltage drop along its length when it carries a 4000-A current? The resistivity of the metal is 1.68 × 10-8 ? ? m
A) 0.067 V B) 0.67 V C) 0.034 V D) 0.34 V