A body at the end of a spring oscillates up and down ten times in five seconds. The period of oscillation is 2 s
a. True
b. False
Indicate whether the statement is true or false
True
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Which of the following provides important evidence for the existence of dark matter in clusters of galaxies?
A) careful counts of the numbers of galaxies in clusters B) the relative proportions of spiral and elliptical galaxies in clusters C) the high temperature and distribution of gas between the galaxies in clusters D) the total luminosity in visible light coming from cluster galaxies
A diffraction grating is to be used to find the wavelength of the emission spectrum of a gas. The grating spacing is not known, but a light of a known wavelength of 632.8 nm is deflected by 43.2° in the second order by this grating
Light of the wavelength to be measured is deflected by 34.9° in the second order. What is the wavelength of this light?
A heat engine absorbs 2 500 J of heat from a hot reservoir and expels 1 000 J to a cold reservoir. When it is run in reverse, with the same reservoirs, the engine pumps 2 500 J of heat to the hot reservoir, requiring 1 500 J of work to do so. Find the ratio of the work done by the heat engine to the work done by the pump. Is the heat engine reversible?
a. 1.0 (no) b. 1.0 (yes) c. 1.5 (yes) d. 1.5 (no) e. 2.5 (no)
A hydrogen atom in the ground state absorbs a 12.75-eV photon. To what level is the electron promoted? (The ionization energy of hydrogen is 13.6 eV)
a. n = 2 c. n = 5 b. n = 3 d. n = 4