Consider a laser that emits a highly collimated beam of light. Suppose the beam diameter is 2 mm and let the power level or radiant flux, be 100 mW. Neglecting any divergence of the beam, show that the irradiance is 3.18 W/cm.
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- Just like the optical part of the spectrum, radio waves can be described in terms of photons - although they can be very difficult to detect. Consider the photons in radio waves from an FM station that has a 88.3-MHz broadcast frequency. Find the energy in joules of a photon in the radio waves.For a 2000K blackbody, by what percentage is the Rayleigh–Jeans law in error at wavelengths of 1.0 mm?Find the maximum kinetic energy possible for an electron ejected from aluminum (with a work function of 4.08 eV) by a 247 nm photon. Show the algebraic form of equation(s) applied and report you answer with the correct units and significant figures.
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