An excimer laser used for vision correction emits UV radiation with a wavelength of 193 nm. (a) Calculate the photon energy in eV. (b) These photons are used to evaporate corneal tissue, which is very similar to water in its properties. Calculate the amount of energy needed per molecule of water to make the phase change from liquid to gas. That is, divide the heat of vaporization in kJ/kg by the number of water molecules in a kilogram, (c) Convert this to eV and compare to the photon energy. Discuss the implications.
An excimer laser used for vision correction emits UV radiation with a wavelength of 193 nm. (a) Calculate the photon energy in eV. (b) These photons are used to evaporate corneal tissue, which is very similar to water in its properties. Calculate the amount of energy needed per molecule of water to make the phase change from liquid to gas. That is, divide the heat of vaporization in kJ/kg by the number of water molecules in a kilogram, (c) Convert this to eV and compare to the photon energy. Discuss the implications.
An excimer laser used for vision correction emits UV radiation with a wavelength of 193 nm. (a) Calculate the photon energy in eV. (b) These photons are used to evaporate corneal tissue, which is very similar to water in its properties. Calculate the amount of energy needed per molecule of water to make the phase change from liquid to gas. That is, divide the heat of vaporization in kJ/kg by the number of water molecules in a kilogram, (c) Convert this to eV and compare to the photon energy. Discuss the implications.
Interaction between an electric field and a magnetic field.
Consider the following.
(a) Model the tungsten filament of a lightbulb as a blackbody at temperature 3320 K. Determine the wavelength of light it emits most strongly.
Your response differs from the correct answer by more than 10%. Double check your calculations. nm
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 88.5-MHz broadcast frequency.
A. Find the energy, in joules, of a photon in the radio waves.
B. Find the energy, in electron volts, of a photon in the radio waves.
The temperature of an electric heating element is 150°C. At what wavelength does the radiation emitted from the heating element reach its peak? Model the tungsten filament of a lightbulb as a black body at temperature 2 900 K. (a) Determine the wave- length of light it emits most strongly. (b) Explain why the answer to part (a) suggests that more energy from the lightbulb goes into infrared radiation than into vis- ible light.
Microbiology with Diseases by Body System (5th Edition)
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