An ideal monatomic gas cools from 455.0 K to 405.0 K at constant volume as 831 J of energy is removed from it. How many moles of gas are in the sample? The ideal gas constant is R = 8.314 J/mol ? K

A) 1.33 mol B) 0.725 mol C) 2.15 mol D) 2.50 mol E) 1.50 mol


A

Physics & Space Science

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In a single-slit diffraction experiment, the width of the slit is 1.90 ?m. If a beam of light of wavelength 610 nm forms a diffraction pattern, what is the angle associated with the first minimum above the central bright fringe?

A) 9.35° B) 11.4° C) 12.2° D) 39.9° E) 18.7°

Physics & Space Science

Physicists today consider the Bohr model of the atom to be

A) an accurate picture of a hydrogen atom. B) totally useless — of historical interest only. C) oversimplified, but nevertheless useful.

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If the voltage applied to a parallel-plate capacitor is doubled, the electric field between the plates

A) is halved. B) quadruples. C) is tripled. D) remains the same. E) is doubled.

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The pressure in the oil (S = 0.86) pipe is 12 kPa. The pressure in the water pipe is nearest:


(A) -34.8 kPa
(B) -28.8 kPa
(C) -18.8 kPa
(D) -13.1 kPa

Physics & Space Science