The spectral lines of which series lie in the I.R region.

1. Lyman
2. Balmer
3. Brackett
4. All of these
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Answer: C
Explanation:
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The spectral lines of which series lie in the I.R region.

1. Paschen
2. Brackett
3. Pfund
4. All of these
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Answer: D
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Which of the following series lie in ultraviolet region?

1. Lyman
2. Paschen
3. Brackett
4. Balmer
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Answer: A
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Lyman series is obtained when an electron jumps from higher energy level to;

1. ground level
2. 2nd level
3. 3rd level
4. 4th level
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Answer: A
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Balmer series is obtained when an electron jumps from higher energy level to;

1. ground level
2. 2nd level
3. 3rd level
4. 4th level
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Answer: B
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Which equation had no theoretical basis at all but it worked accurately in finding the wavelength of spectral lines of hydrogen atom;

1. Balmer equation
2. Schrodinger wave equation
3. Bohr's equation
4. none of these
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Answer: A
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Max Planck proposed his Quantum theory in;

1. 1905
2. 1913
3. 1909
4. 1900
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Answer: D
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According to Max Planck, molecules of hot body radiate energy;

1. continuously
2. discontinuously
3. fastly
4. irregularly
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Answer: B
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Atoms or molecules emit or absorb radiant energy in the form of;

1. small unit waves
2. pulse of energy
3. quanta or photons
4. all of these are correct
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Answer: D
Explanation:
• small unit of waves or pulse of energy is called photon or quanta
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Atoms or molecules emit or absorb radiant energy in the form of;

1. continuous waves
2. ultraviolet radiations
3. quanta or photons
4. x-rays
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Answer: C
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