Changes in Earth's history are recorded
A) in the rock record.
B) in magnetic tape at the bottom of the oceans.
C) by rocks at the Library of Congress.
D) Moon rocks.
Answer: A
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If an object's orbital velocity exceeds a celestial object's escape velocity, the object will follow closed orbits
a. True b. False Indicate whether the statement is true or false
Approximately how long after the Solar System formed did it take for oxygen to get to within 80 percent of its present abundance in Earth's atmosphere?
a. 4 billion years b. 1 billion years c. 400 million years d. 1 million years e. Oxygen was always a primary component of Earth's atmosphere.
The pressures p and volumes V of five ideal gases, with the same number of molecules, are given below. Which has the highest temperature?
A. p = 1 × 105 Pa and V = 10 cm3 B. p = 3 × 105 Pa and V = 6 cm3 C. p = 4 × 105 Pa and V = 4 cm3 D. p = 6 × 105 Pa and V = 2 cm3 E. p = 8 × 105 Pa and V = 2 cm3
A stopping potential of 0.50 V is required when a phototube is illuminated with monochromatic light of wavelength 590 nm. Monochromatic light of a different wavelength is now shown on the tube, and the stopping potential is measured to be 2.30 V
What is the wavelength of this new light? (c = 3.00 × 108 m/s, e = - 1.60 × 10-19 C, h = 6.626 × 10-34 J • s, 1 eV = 1.60 × 10-19 J) A) 320 nm B) 300 nm C) 340 nm D) 360 nm E) 410 nm