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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 =lambda_(1) Å. It then get retarded through 19 volts and then has a wavelength lambda_(2) Å. A further retardation through 32 volts changes the wavelength to lambda_(3)Å, What is (lambda_(3)-lambda_(2))/(lambda_(1))? |
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