1.

In an electron microscope, the electrons are accelerated by a voltage of 14 kV. If the voltage is changed to 224 kV, then the de Broglie wavelength associated with the electrons would……………

Answer»

increase by 2 time
DECREASE by 2 times
decrease by 4 times
increase by 4 times

Solution :At Voltage, V = 14 kV
de-Broglie wavelength of ELECTRON, `LAMBDA = (12.3)/(sqrt(14000)) Å = 0.104 Å`
At voltage, V = 224 kV
`lambda. = (12.3)/(sqrt(224000))Å = 0.026 Å`
`(lambda)/(lambda.) = (0.104)/(0.0260) = 4 rArr lambda = 4 lambda.`
`lambda. = (lambda)/(4)`


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