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Which of the following statements is/are...

Which of the following statements is/are false ?

A

The energy of photoelectrons emitted from agiven metal by soft X-rays have less energy than those emitted by hard X-rays

B

To increase the intensity of X-rays, the filament current should be increased

C

The characteristic X-rays have continuous range of wavelengths

D

X-rays were named so because of their my sterious nature at the time of discovery

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