Photons of light can be absorbed by an atom of an element ____
a. if they match one of several possible wavelengths that are absorbed by that element
b. if they match one of several possible wavelengths that are absorbed by all elements
c. if they match the only particular wavelength that can be absorbed by that element
d. if they match the only particular wavelength that can be absorbed by all elements
e. no matter what wavelength they have
a
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Solar flares have no known effect on Earth
a. True b. False Indicate whether the statement is true or false
What is the key distinction between protostars and true (main-sequence) stars?
A) Protostars generate most of their energy from gravitational contraction, and stars generate it from nuclear fusion. B) Protostars are larger and more luminous than stars. C) Protostars have stronger magnetic fields than stars. D) Protostars are supported by thermal pressure, and stars are supported by degeneracy pressure.
Suzie Skydiver jumps from a high-flying plane. As her velocity of fall increases, her acceleration
A) increases. B) decreases. C) remains unchanged regardless of air resistance.
A 20.0 kg hollow cylinder (I = 
) has a diameter of 50.0 cm. The cylinder is rolling down a hill with a velocity of 5.00 m/s. The rotational kinetic energy of the rolling cylinder is
A. 225 J. B. 200 J. C. 175 J. D. 150 J. E. 250 J.