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Photon Energy, Number of Photons and Intensity for GUJCET: 8 solved questions

Real GUJCET paper questions on photon energy, number of photons and intensity, part of dual nature of matter and radiation. Each opens with the options, the correct answer and a step-by-step solution. Papers run from 2008 to 2026. No sign-in needed to read them.

What this topic asks

• Photon energy, momentum and mass — 4 questions
• Counting photons — 3 questions
• Intensity, area and distance — 1 question

All 8 questions with solutions

• The number of photons of wavelength 660 nm emitted per second by an electric bulb of 60 W is . (Take h = 6.6×… GUJCET 2008
• The frequency of a photon having energy 100 eV is Hz. (Take h = 6.62×10⁻³⁴ J s; 1 eV = 1.6×10⁻¹⁹ J) GUJCET 2011
• If the energy of a photon of wavelength 6000 A is 3.2×10⁻¹⁹ J, the energy of a photon of wavelength 4000 A wi… GUJCET 2018
• is the wavelength of a photon of energy 35 keV. (Take h = 6.625×10⁻³⁴ J s, c = 3×10⁸ m s⁻¹ and 1 eV = 1.6×10⁻… GUJCET 2018
• The number of photons emitted per second by a bulb of power 66 W emitting waves of wavelength 600 nm is . (Ta… GUJCET 2023
• Monochromatic light of frequency 6 × 10¹⁴ Hz is produced by a laser. The power emitted is 4 × 10⁻³ W. How man… GUJCET 2025
• Out of the following physical quantities which quantity has the same unit as that of Planck's constant? GUJCET 2026
• An image of the Sun is formed by a convex lens of focal length 40 cm on the metal surface of a photocell, and… RS Academy GUJCET booklet