Why do photographs in a book or magazine look grainy when magnified?

Q: A cavity radiator has its maximum spectral radiance at a wavelength of 6,9×10-7 m. If the body is…

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Q: You are given a small bar of an unknown metal. You find the density of the metal to be 18.6 g/cm3.…

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Q: A photon of red light having wavelength 660 nm has energy equal to (h= 6.6 × 10-34Js) A 1.0 × 10-¹⁹J

A: Given data, Wavelength of photon λ=600 nm=600×10-9 m. Plank's constant h=6.6×10-34 J-s.

Q: Find the gram-atomic weight of this metal and tentatively identify it.

A: For FCC Z=4

Q: 2. The power of high power laser beams is often measured using a water-cooled optical calorimeter.…

A: Magnitude of temperature RiseΔT. Given, Power of beamP=1 kW=1000 WFlow rate of waterQ=1…

Q: An x-ray beam having wavelength 0.300 mm is scattered from the surface of a material.Determine the…

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Q: Why does the candle light appears dimmer as you move back?

A: The given problem can resolved using the concept of intensity of light.  Intensity of light (I) can…

Wien's displacement law

Students often get confused between Wien's displacement law and Planck's radiation law. Although both are historically related, yet they are conceptually different. Planck's law helps determine the spectrum of a blackbody, while Wien's law determines the relationship between peak wavelength and temperature.