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.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.The intensity of blackbody radiation peaks at a wavelength of 583 nm. (a) What is the temperature (in K) of the radiation source? (Give your answer to at least 3 significant figures.) K (b) Determine the power radiated per unit area (in W/m2) of the radiation source at this temperature. W/m?
- A laser beam of power 6.0 W and diameter of 2.0 mm is directed upward at a highly reflective oil droplet of density 0.85 g/cm^3. What maximum radius droplet can be levitated by the radiation pressure of the laser beam?Assume the intensity of solar radiation incident on the cloud tops of the Earth is 1 677 W/m². (a) Taking the average Earth-Sun separation to be 1.496 x 10¹1 m, calculate the total power radiated by the Sun. 4.905E26 x Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. W (b) Determine the maximum value of the electric field in the sunlight at the Earth's location. kv/m (c) Determine the maximum value of the magnetic field in the sunlight at the Earth's location. μT13.
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