The total number and mass of neutrons in 7 mg of 14C would be 

(Assume that mass of a neutron = 1.675 × 10–27 kg)

1. 2.41 × 1021 , 4.03 × 106 kg2. 6.23 × 1023 , 1.67 × 10-21kg3. 1.22 × 1022 , 4.03 × 106 kg4. 2.41 × 1021 , 4.03 × 10-6 g

Subtopic:  Number of Electron, Proton & Neutron |
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The wave number of a light whose time period is 2.0 × 10–10 s would be

1. 16.66 m-1

2. 1. 66 m-1

3. 32.34 m-1

4. 12.34 m-1

Subtopic:  Introduction of Atomic Structure |
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The number of photons of light with a wavelength of 4000 pm that provide 1J of energy would be 

1. 2.01 × 10162. 2.01 × 10193. 4.14 × 10234. 2.14 × 1021

Subtopic:  Planck's Theory |
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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

Subtopic:  Planck's Theory |
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A 25-watt bulb emits monochromatic yellow light with a wave length of 0.57µm. The rate of emission of quanta per second would be
1. 7.17 × 10-19 s-1
2. 4.13 × 1016 s-1
3. 7.17 × 1019 s-1
4. 1.26 × 1020 s-1

Subtopic:  Planck's Theory |
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The 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

Subtopic:  Hydrogen Spectra |
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The energy associated with the fifth orbit of a hydrogen atom is 

1. -2.18 × 10-18 J2. -8.72 × 10-20 J3. -3.88 × 10-21 J4. -8.72 × 10-19 J

Subtopic:  Hydrogen Spectra |
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The wave number for the longest wavelength transition in the Balmer series of atomic hydrogen would be -

1. 1.52 × 106 m-12. 3.14 × 106 cm-13. 15.2 × 106 m-14. 1.52 × 106 cm-1

Subtopic:  Hydrogen Spectra |
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The energy of an electron in H - atom is given by En = (2.18 × 10-18 )n2 J.  The shortest wavelength of light that can be used to remove an electron completely from n = 2 orbit will be

1. 3647 A°2. 5132 A°3. 3017 A°4. None of these

Subtopic:  Hydrogen Spectra |
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The wavelength of an electron moving with a velocity of 2.05 × 107 m s-1  would be 

1. 4.65 × 10-12 m
2. 3.55 × 10-11 m
3. 2.34 × 1011 m
4. 6.43 × 10-11 m

Subtopic:  De Broglie Equation |
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