The K.E of photoelectrons emitted from metal surface is given by the relation (where ν is frequency of incident light and ν_ois the threshold frequency.

1. 1/2 mv² = hν_o
2. 1/2 mv² = hν
3. 1/2 mv² = hν + hν_o
4. 1/2 mv² = hν - hν_o
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Answer: D
Explanation:
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1/2 mv² = hν - W is equation of a straight line. Its slope is equal to;

1. threshold frequency
2. work function
3. Planck's constant
4. none of these
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Answer: C
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According to Bohr's model, the angular momentum of an electron revolving around the nucleus is given by the relation;

1. mvr = h / 2π
2. mvr = nh / 4π
3. mvr = nh / 2π
4. mvr = n²h² / 4π
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Answer: C
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In Bohr's model, the angular momentum of an electron revolving in second orbit around the nucleus is given by the relation;

1. mvr = 4h / 2π
2. mvr = h / π
3. mvr = 2h / 4π
4. mvr = 4h² / 4π
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Answer: B
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The spectrum of which one of the followings is similar to that of hydrogen atom;

1. Li⁺ ion
2. He⁺ ion
3. H⁺ ion
4. Na⁺ ion
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Answer: B
Explanation:
• He⁺ ion has only one electron like H-atom.
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Bohr's model can not explain the spectrum of;

1. H atom
2. Li⁺² ion
3. Be atom
4. He⁺ ion
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Answer: C
Explanation:
• Since Bohr's model can only explain the spectrum of monoelectronic system.
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If r is the radius of first orbit of H-atom, then radius of its nth orbit will be;

1. n² r
2. n r
3. n /r
4. r /n
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Answer: A
Explanation:
• Since r_n = a_o (n²) , where a_o is the radis of first orbit.
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