Where did the elements heavier than hydrogen and helium come from?
A) They were produced in the Big Bang.
B) They evolved from hydrogen and helium shortly after the Big Bang.
C) They were produced inside dense interstellar gas.
D) They were produced inside stars.
E) All of the above
D
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Each of the following is a prediction of the theory of relativity (special or general). Which one is crucial to understanding how the Sun provides light and heat to Earth?
A) Gravity is curvature of spacetime. B) E = mc2 C) If you observe someone moving by you, you'll see his/her time running slow. D) Space is different for different observers. Time is different for different observers. Spacetime is the same for everyone.
How long ago did multicellular life forms appear in the fossil record?
A) 4.5 billion years ago B) 3.8 billion years ago C) one billion years ago D) 63 million years ago E) 30 million years ago
Many pulsars have periods that are gradually getting longer as the spinning neutron stars lose energy
a. True b. False Indicate whether the statement is true or false
X-rays with a wavelength of 0.00100 nm are scattered at 130° by free electrons. What is the kinetic energy of each recoil electron?
(1 eV = 1.60 × 10-19 J, melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s) A) 0.50 MeV B) 0.99 MeV C) 2.0 MeV D) 0.34 MeV E) 0.68 MeV