An ideal spring with a spring constant of is stretched from equilibrium to 2.9 m. How much work is done in the process?
A) 93 J
B) 186 J
C) 47 J
D) 121 J
A
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Matter Waves: Electrons with a speed of 2.1 × 106 m/s are directed towards a 1.0-?m wide slit. An electron detector is placed 1.0 m behind the slit. How wide is the central maximum of the electron diffraction pattern on the detector? (h = 6.626 × 10-34 J ? s, melectron = 9.11 × 10-31 kg)
A. 690 ?m B. 350 ?m C. 1000 ?m D. 1400 ?m
If the distance between the slits in Young's two-slit experiment is decreased, which one of the following statements is true of the interference pattern?
A) The distance between the maxima stays the same. B) The distance between the maxima decreases. C) The distance between the minima stays the same. D) The distance between the minima increases. E) Impossible to tell without knowing the wavelength of light in use.
When uranium-238 (Z = 92) is bombarded with a neutron, it can change into
a. uranium-237. b. uranium-239. c. protactinium-239 (Z = 91). d. neptunium-239 (Z = 93). e. none of the above.
A ball is thrown straight upward from ground level with a speed of How much time passes before the ball strikes the ground if we disregard air resistance?
A) 3.7 s B) 1.8 s C) 1.1 s D) 0.6 s