X-rays of energy 3.5 x eV scatter through an angle of 105° off of a free electron. What is the energy (in eV) of the scattered x-rays?
(melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
3.2 × 104 eV
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Oxygen molecules are 16 times more massive then hydrogen molecules. At a given temperature, the average molecular kinetic energy of oxygen, compared to hydrogen
A. is greater. B. is less. C. is the same. D. more data is required to answer correctly
An interstellar gas is emitting 10-centimeter wavelength radiation, and a nearby star is emitting 10-micrometer wavelength radiation. Which of these can you observe through an Earth-based telescope?
A. the star B. the interstellar gas C. both interstellar gas and the star D. None of these choices are correct.
Taurus the Bull is a(n)
a. star. b. asterism. c. galaxy. d. constellation.
When an electron in an atom moves from a lower energy level to a higher one, a ______________ is ______________
a. photon; emitted b. proton; emitted c. photon; absorbed d. proton; absorbed