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- A dielectric material has an absorption coefficient of 0.25 cm−1. A plate of thickness 3 cm is made from this material, and light with intensity 20 W m−2 is incident on the front. Ignoring reflection losses, calculate the intensity transmitted through the plate.Give your answer as a decimal to 2 d.p.Electrons are ejected from a metallic surface with speeds ranging up to 4.1 × 105 m/s when light with a wavelength of 630nm is used. What is the cutoff frequency for this surface? Express your answer in terms of 1014 Hz and round it to the nearest hundredth. For example, if you get 1.234 x 1014 Hz, you type in 1.23. (Hint: you should first calculate the work function of the surface.) Use h=6.626x1034 Js; c=3 x108 m/s. ; me=9.11x10-31kg Js; c=3 x108 m/s. ; me=9.11x1031kg(a) Calculate the wavelength of light in vacuum that has a frequency of 8.5*10^9Hz. (b) What is its wavelength in glycerine? (The index of refraction of glycerine is 1.473.) (c) Calculate the energy of one photon of such light in vacuum. Express the answer in electron volts
- Solve, with no calculus.A light beam of wavelength λ= 500 nm, beam diameter 5 mm and intensity I is propagating in a medium. The absorption cross section of the medium is 2.3×10-19 cm-2 and upper-level lifetime is 10 µs. Calculate the power of the light beam that make the absorption coefficient of the medium (α) decays to 50% of its initial value (αo).Visible light falls into wavelength ranges of 400-700 nm, for which 1 m=1×109 nm The energy and wavelength of light are related by the equationE=hcλ where E is energy in Joules, h is Planck's constant ( 6.626×10−34 J-s ), c is the speed of light ( 2.998×108 m/s), and λ is the wavelength in m. If a visible light photon has a wavelength of 632.3 nm, what is the energy of the photon (in J)?