If an electron has the same de Broglie wavelength as the wavelength of a 390-nm photon in vacuum, what is the speed of the electron? (melectron = 9.11 × 10-31 kg, c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s)
A) 1900 m/s
B) 2100 m/s
C) 1700m/s
D) 1500 m/s
E) 540 m/s
A
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a. True b. False Indicate whether the statement is true or false
The rocks found in Greenland with carbon isotope ratios suggestive of life are
A) igneous B) sedimentary C) metamorphic D) a mixture of sedimentary and metamorphic
Measuring the amount of deuterium in the universe allows us to set a limit on
A) the density of ordinary (baryonic) matter the universe. B) the total amount of mass in the universe. C) the acceleration of the universe. D) the current age of the universe.