The Bohr model of the atom is akin to a

A) miniature solar system.
B) blob of plum pudding, where raisins represent electrons.
C) central heavy ball with lighter balls connected by springs.
D) all of the above


Answer: A

Physics & Space Science

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Two piano strings are simultaneously played – their mass and length are identical, but the tensions differ. If the first string resonates with a fundamental frequency of 330 Hz, and its tension is 1.2% greater than that of the second string, what is the fundamental frequency of the second string?

A. 328 Hz B. 326 Hz C. 336 Hz D. 334 Hz

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A) X-rays. B) the ultraviolet. C) the visible. D) the infrared. E) all wavelengths.

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A. A Coulomb per second B. A volt C. A volt per ampere D. An ampere per second

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For hydrogen, the transition from the second to the fourth energy level produces:

A) a red emission line. B) a blue green absorption line. C) a violet emission line. D) an infrared emission line. E) an ultraviolet absorption line.

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