The number of cycles of a periodic process that occur per unit time is called the __________
Fill in the blank(s) with correct word
frequency
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Collisions between galaxies typically unfold over a period of ________
A) hundreds of millions of years B) several days C) several months D) thousands of years
Star #1 is approaching the Earth with speed v. Star #2 is receding from the Earth with the same speed v. Measurements of the same spectral line from each of the stars show Doppler shifts in frequency. The light from which star will have the larger magnitude shift in frequency?
a. star #1 b. Both stars will have the same shift. c. The value of the speed must be known before an answer can be found. d. star #2
A silver bar of length 30 cm and cross-sectional area 2.0 cm2 is used to transfer heat from a 100°C reservoir to a 0°C block of ice. How much ice is melted per second? (For silver, k = 427 W / m • °C. For ice, Lf = 334,000 J/kg.)
a. 4.2 g/s c. 0.80 g/s b. 0.085 g/s d. 0.043 g/s
An electron is bound in an infinite well (a box) of width 0.10 nm. If the electron is initially in the n = 8 state and falls to the n = 7 state, find the wavelength of the emitted photon
(c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg) What will be an ideal response?