A dental X-ray typically affects 194 g of tissue and delivers about 3.6 µJ of energy using X-rays that have wavelengths of 0.025 nm. What is the energy Ephoton, in electron volts, of X-ray photons? eV Ephoton How many photons are absorbed during the dental X-ray? Assume the body absorbs all of the incident X-rays. photons number of photons absorbed:

Given that the energy of an electron in the He+ ion is Z²RH n² En = - } what is the energy of a photon that can excite an electron from the ground state to the first excited state? a. 4/3 RH b. RH c. 5 RH d. 4 RH e. 3 RH

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An x-ray of strikes a free electron and scatters with a wavelength of 0.1252 nm at 60.0°. a. What is the wavelength of the incident photon (from the x-ray source)? b. Calculate the wavelength of an x-ray that is scattered at 30.0° scattered photon incident photon target electron scattered electron

MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A solid metal sphere emits 1.62 x 1020 photons every second with a radiating power of 1.93 W. (a) Determine the energy associated with each photon. eV (b) Assuming the sphere's power output is associated with the peak wavelength, determine the temperature of the sphere at which this wavelength is emitted. K Additional Materials O Reading

3.0 eV photons excite atoms in a gas from their ground state to the n = 3 excited state. The atoms are then observed emitting 2.0 eV photons. Usingwhat you learned in the table above, what other emitted photon energies would be observed?A. 3.0 eV and 5.0 eV      B. 3.0 eV and 1.0 eV           C. 1.0 eV and 4.0 eVD. 3.0 eV only                E. 1.0 eV only

The work function of cesium is 2.1 eV. ▾ Part A Determine the lowest frequency photon that can eject an electron from cesium. Express your answer with the appropriate units. Templates Symbols undo' rego Teset keyboard shortcuts Help Value Units Request Answer Part B Determine the maximum possible kinetic energy in electron volts of a photoelectron ejected from the metal that absorbs a 320-nm photon. Express your answer in electronvolts. Templates Symbols undo' redo Teset keyboard shortcuts Help Kmax= eV f= Submit