Carbon-14 is produced in the atmosphere principally by

A) plants and animals.
B) cosmic-ray bombardment.
C) nitrogen bombardment.
D) photosynthesis.
E) none of the above


Answer: B

Physics & Space Science

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A violin with string length 32 cm and string density 1.5 g/cm resonates with the first overtone from a 2.0-m long organ pipe with one end closed and the other end open. What is the tension in the string?

A) 1000 N B) 110 N C) 450 N D) 4100 N E) 56 N

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For n = 5, how many allowed values are possible for the orbital quantum number and the orbital magnetic quantum number?

a. 5, 11 c. 5, 9 b. 6, 12 d. 4, 9

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A satellite of mass 500 kg orbits the earth with a period of 6,000 s. The earth has a mass of 5.97 × 1024 kg, a radius of 6.38 × 106 m, and G = 6.67 × 10-11 N ? m2/kg2

(a) Calculate the magnitude of the earth's gravitational force on the satellite. (b) Determine the altitude of the satellite above the earth's surface.

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An intrinsically very bright star might appear faint if it is far away

Indicate whether the statement is true or false

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