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12.Atoms
normal
When the accelerating voltage applied on the electrons increased beyond a critical value
A
Only the intensity of the various wavelengths is increased
B
Only the wavelength of characteristic relation is affected
C
The spectrum of white radiation is unaffected
D
The intensities of characteristic lines relative to the white spectrum are increased but there is no change in their wavelength
Solution
The emission of charactaristic $x$ – rays starts only when the incident electrons are accelarated beyond a certain critical value so that intensity of characteristic lines relative to the white spectrum are increased, but there is no change in the wavelength.
Standard 12
Physics
