if an electron accelerated from rest through 100 volts is retarded but 19 volts . The ratio of the de brogile wavelengths will be?
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An electron , practically at rest , is initially accelerated through a potential difference of 100 volts . It then has a de Broglie wavelength = λ1Å . It then gets retarded through 19 volts and then has wavelength λ2Å . A further retardation through 32 volts changes the wavelength to
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According to de-broglie equation;
Wavelength associated with electron,
λ=
V
12.27
A
o
=
100
12.27
A
o
=
10
12.27
=1.227A
o
and the wavelength corresponds to X-rays.
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