Suppose that the electrons in an atom have 0.1eV of energy. In these units, Planck's constant is about 4×10-15eVs. The highest frequency which could possibly be emitted is

(A) 4×1015Hz. -- (B) 0.1 Hz.
(C) 2.5×1015Hz. (D) 2.5×1013Hz.


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Suppose that the electrons in an atom have 0.1eV of energy. In these units, Planck's constant is about 4×10-15eVs. The highest frequency which could possibly be emitted is

(A) 4×1015Hz. -- No.

Solve E=hf for f.

Try again.
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Suppose that the electrons in an atom have 0.1eV of energy. In these units, Planck's constant is about 4×10-15eVs. The highest frequency which could possibly be emitted is

(B) 0.1 Hz. -- No.

Solve E=hf for f.

Try again.
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Suppose that the electrons in an atom have 0.1eV of energy. In these units, Planck's constant is about 4×10-15eVs. The highest frequency which could possibly be emitted is

(C) 2.5×1015Hz. -- No

Notice that E = 10-1eV

Try again.
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Suppose that the electrons in an atom have 0.1eV of energy. In these units, Planck's constant is about 4×10-15eVs. The highest frequency which could possibly be emitted is

(D) 2.5×1013Hz. -- Yes. E=hf, so f = E/h

or f = (10-1eV)/(4×10-15eVs) = ¼×1014s-1

Check the other answers.
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