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A beam of light of intensity I is normally incident on a plate of area A. If plate absorbs fraction η of incident light and reflects rest of it back, then the force exerted by the incident light on the plate is given by [c=speed of light]

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Important Questions on Dual Nature of Radiation and Matter

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IMPORTANT
Achieve CUET (UG) Physics Practice Book>Chapter 11 - Dual Nature of Radiation and Matter>Exercise>Q 56
What will be the number of photons emitted per second by a 10 W sodium vapour lamp, assuming that 90% of the consumed energy is converted into light? The wavelength of sodium light is 590 nm, h=6.63×10-34 J s.
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Achieve CUET (UG) Physics Practice Book>Chapter 11 - Dual Nature of Radiation and Matter>Exercise>Q 57
A proton, a deuteron and an α -particle accelerated through the same potential difference enter a region of uniform magnetic field moving perpendicular to B. The ratio of their KE is
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IMPORTANT
Achieve CUET (UG) Physics Practice Book>Chapter 11 - Dual Nature of Radiation and Matter>Exercise>Q 58
Light is
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IMPORTANT
Achieve CUET (UG) Physics Practice Book>Chapter 11 - Dual Nature of Radiation and Matter>Exercise>Q 59
Calculate the number of photons emitted by a 60 W bulb per second, if 10% of the electrical energy supplied ( E=3.3 x 10-19 ) to an incandescent light bulb is radiated as visible light
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Achieve CUET (UG) Physics Practice Book>Chapter 11 - Dual Nature of Radiation and Matter>Exercise>Q 60
Which of the following statements about photon is incorrect
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Achieve CUET (UG) Physics Practice Book>Chapter 11 - Dual Nature of Radiation and Matter>Exercise>Q 61
The energy of photons of visible light with maximum wavelength in eV is approximately
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Achieve CUET (UG) Physics Practice Book>Chapter 11 - Dual Nature of Radiation and Matter>Exercise>Q 62
If h is the Planck's constant, then the momentum of a photon of wavelength 0.01 Å is
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Achieve CUET (UG) Physics Practice Book>Chapter 11 - Dual Nature of Radiation and Matter>Exercise>Q 63
The energy of photons in a beam whose wavelength is 6.20×10-5 cm is