When a beam of accelerated electrons hit...

When a beam of accelerated electrons hits a target , a continuous `X` - ray spectrum is emitted from the target. Which of the following wavelength is absent in `X` - ray spectrum , if the `X` - ray tube is operating at `40,000 "volts"`?

A

`0.25 Å`

B

`0.5 Å`

C

`1.5 Å`

D

`1.0 Å`

Verified by Experts

The correct Answer is:

A

`lamda_("min")(Å)=(12375)/V=(12375)/(40000)=0.30Å`
Less than this is not possible.

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