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:
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe 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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAn element with a mass number of 81 contains 31.7% more neutrons as compared to protons. The atomic symbol of the element would be
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAn 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 -
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA 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:
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIf the photon detector receives a total of 3.15 J from the radiation of 600 nm, the number of photons received by the detector would be
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA radiation source emitted 2.5 × 1015 photons in 2 nanoseconds. Energy of the source is -
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyEmission 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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIf the velocity of the electron is 1.6 × 106 . The de Broglie wavelength associated with this electron is
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIf 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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology