# If the diameter of a carbon atom is 0.15 nm, the number of carbon atoms that can be placed side by side in a straight line across the length of the scale of length 20 cm long will be:

Subtopic:  Introduction of Atomic Structure |
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The charge on the oil drop is –1.282 × 10–18C. The number of electrons present in it would be

1. 15

2. 8

3. 2

4. 6

Subtopic:  Number of Electron, Proton & Neutron |
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An element with a mass number of 81 contains 31.7% more neutrons as compared to protons. The atomic symbol of the element would be

Subtopic:  Number of Electron, Proton & Neutron |
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An ion with a mass number of 56 contains 3 units of positive charge and 30.4% more neutrons than electrons. The symbol of the ion is -

Subtopic:  Number of Electron, Proton & Neutron |
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A nitrogen laser produces radiation at a wavelength of 337.1 nm. If the number of photons emitted is 5.6 × 1024, the power of the laser is:

Subtopic:  Planck's Theory |
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If the photon detector receives a total of 3.15$×{10}^{-18}$ J from the radiation of 600 nm, the number of photons received by the detector would be

Subtopic:  Planck's Theory |
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A radiation source emitted  2.5 × 1015 photons in 2 nanoseconds. Energy of the source is -

Subtopic:  Planck's Theory |
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Emission transitions in the Paschen series end at orbit n = 3 and start from orbit n and can be represented as v = 3.29 × 1015 (Hz)The value of n if the transition is observed at 1285 nm is
1. 6
2. 5
3. 8
4. 9

Subtopic:  Hydrogen Spectra |
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If the velocity of the electron is 1.6 × 106 ${\mathrm{ms}}^{-1}$. The de Broglie wavelength associated with this electron is

Subtopic:  De Broglie Equation |
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If the wavelength of a neutron is 800 pm, then the characteristic velocity associated with the neutron is

1. 494 m s-1
2. 567 m s-1
3. 494 cm s-1
4. 501 m s-1

Subtopic:  De Broglie Equation |
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