A dental x-ray typically affects 225 g of tissue and delivers about 3.95 ?J of e

Question

A dental x-ray typically affects 225 g of tissue and delivers about 3.95 ?J of energy using x-rays that have wavelengths of 0.0275 nm. What is the energy (in electron volts) of a single photon of these x-rays? How many photons are absorbed during the dental x-ray?

A dental x-ray typically affects 225 g of tissue and delivers about 3.95 MuJ of energy using x-rays that have wavelengths of 00275 nm. What is the energy (in electron volts) of a single photon of these x-rays? Number eV How many photons are absorbed during the dental x-ray? Number photons

Explanation / Answer

Here ,

wavelength = 0.0275 nm

energy of a single photon in eV = h*c/(wavelength * e)

energy of a single photon in eV = h*3*10^8 /(0.0275 *10^-9 * 1.602 *10^-19)

energy of a single photon in eV = 45116.4 eV

Now ,

Number of photons = total energy/energy of 1 photons

Number of photons = 3.95 *10^-6/(45116.4 * 1.602 *10^-19)

Number of photons = 5.464 *10^8

the number of photons is 5.464 *10^8

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