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- Find the energy of the following. Express your answers in units of electron volts, noting that 1 eV = 1.60 × 10-1⁹ J. (a) a photon having a frequency of 4.20 x 10¹7 Hz ev (b) a photon having a wavelength of 4.60 x 10² nm eVAn argon-ion laser produces a cylindrical beam of light whose average power is 0.743 W. How much energy is contained in a 3.17-m length of the beam? Number Units → LAstronomers want to observes celestial objects in the electromagnetic spectrum when the atmosphere is opaque . what options do they have?
- 2. Suppose the downward irradiance at the top of a layer of an absorbing gas is 600 Wm2, the upward reflected radiation is 150 Wm-2, and the radiation emerging at the bottom of the layer is 200 Wm-² (a) What is the reflectance of the layer? (b) What is the transmittance of the layer? (c) How much radiation is absorbed in the layer (Wm-²)? (d) What is the absorptance of the layer?How fast must an electron be moving if all its kinetic energy is lost to a single x-ray photon with the following characteristics? (a) The photon has a wavelength of 3.55 x 10-8 m near the high end of the x-ray electromagnetic spectrum. Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully.c (b) The photon has a wavelength of 3.55 x 10-13 m near the low end of the x-ray electromagnetic spectrum,