The number of photons of light with a wavelength of 4000 pm that provide 1J of energy would be
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyElectromagnetic 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 & 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 & Biology
The wavelength of the light emitted when the electron returns to the ground state in the H atom, from n = 5 to n = 1, would be: (The ground-state electron energy is –2.18 × 10-18 j)
1. Wavelength = 9.498 x 10-8 km
2. Wavelength = 12.498 x 10-8 m
3. Wavelength = 9.498 x 10-8 m
4. Wavelength = 9.498 x 10-8 cm
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe neon gas emits radiation of 616 nm. The number of quanta that are present in 2 J of energy is
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology