What basic type of reaction is illustrated by the general equation AB ? A + B?

a. Combination
b. Decomposition
c. Double-replacement
d. Single-replacement


b

Physics & Space Science

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A diffraction grating has 6000. lines per centimeter ruled on it

What is the angular separation between the second and the third orders on the same side of the central order when the grating is illuminated with a beam of light of wavelength 550. nm?

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A box of mass m is placed on an incline with angle of inclination ? . The box does not slide. The magnitude of the frictional force in this case is:

a. ?s mg sin ?. b. mg cos ?. c. mg sin ?. d. not given.

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A 3.00 m organ pipe is open at both ends and contains air. The velocity of sound in air is 331 m/s. What is the frequency of the lowest frequency mode?

A. 39.5 Hz B. 40.2 Hz C. 43.1 Hz D. 47.5 Hz E. 55.2 Hz

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What is the source of acid rain?

A) Acid rain is from dissolved carbon dioxide. B) All rain is acid rain because rain has a pH is less than 7. C) Rain is normally basic, but depending on the weather it can get slightly acidic. D) All rain is acid rain because rain has a hydronium ion concentration greater than 10-7 M. E) none of the above

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