1.

Regarding electromagnetic beam radiation: a. Energy fluence is the number of photons per unit area of a beam b. Beam intensity is the total amount of energy per unit area travelling per unit time c. Wavelength is inversely proportional to frequency d. Frequency is inversely proportional to photon energy (keV) e. Photon energy is inversely proportional to wavelength 

Answer»

a. False. Photon fluence is the number of photons through a cross-section of the beam (i.e. per unit area). Adding the particle energies gives the total amount of energy per unit area and is called energy fluence.

b. True. 

c. True. Wavelength is the distance between crests, when field strength is plotted against distance. Frequency multiplied by wavelength equals velocity (λ x  f V) 

d. False. Frequency is proportional to photon energy; the content of proportionality is called Planck’s constant. 

e. True.



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