Electromagnetic radiation of wavelength 242 nm is just sufficient to ionise sodium atom. The ionisation energy of sodium in kJ mol-1 is -
1. 494
2. 4.94
3. 516
4. 0.50
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA 25-watt bulb emits monochromatic yellow light with a wave length of 0.57µm. The rate of emission of quanta per second would be
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe wavelength of light emitted when the electron in a H atom undergoes the transition from an energy level with n = 4 to an energy level with n = 2, is
1. 586 mm
2. 486 nm
3. 523 nm
4. 416 pm
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe energy associated with the fifth orbit of a hydrogen atom is
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe wave number for the longest wavelength transition in the Balmer series of atomic hydrogen would be -
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe energy of an electron in H - atom is given by En = J. The shortest wavelength of light that can be used to remove an electron completely from n = 2 orbit will be
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe wavelength of an electron moving with a velocity of 2.05 × 107 m s-1 would be
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe kinetic energy of an electron is 3.0 × 10–25 J. Its wave length would be
1. 8.96 × 10-7 m
2. 4.37 × 10-6 m
3. 1.32 × 10-7 m
4. 2.89 × 10-4 m
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe lowest value of n for 'g' orbitals is
1. 4
2. 5
3. 3
4. 1
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAn atom of an element contains 29 electrons and 35 neutrons. The number of protons in the element would be
1. 29
2. 35
3. 6
4. 64
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology