The X-ray coming from a Coolidge tube has a cutoff wavelength of 80 pm. Find the kinetic energy of the electrons hitting the target.
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The kinetic energy of electrons will be - 15.5 KeV.
Given in question is wavelength = 80 pm which will be 8*10^-12 metres.
The energy of X-ray is given by the formula-
E = hc/lambda
H is Plank's constant which has value - 4.14*10^-15 eV/s
C is the speed of light which has value - 3*10^8 m/s.
Keeping values in formula given above-
Energy = 4.14*10^-15*3*10^8/8*10^-12
Energy = 15.5 *10^3 eV
Thus, energy of electrons is - 15.5 KeV.
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(a) The energy comes from striking electron’s kinetic energy.
Explanation:
- When a filament is heated, the emission of electrons happens in an x-ray tube.
- The electric field is generated between the target and the filament by a DC battery.
- This makes the electrons strike the target atoms with more speed. This results in the drop of kinetic energy from the electrons and it leads to photon ejection.
- This results in the non-stop x-ray emission.
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