State the characteristics and uses of $X$-rays.

  • A
    They are charged particles with high energy.
  • B
    They are neutral electromagnetic radiations with very short wavelengths.
  • C
    They are visible light rays with long wavelengths.
  • D
    They are sound waves used for communication.

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In the photoelectric effect,the photocurrent:

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An atom emits energy equal to $4 \times 10^{-12} \, erg$. To which part of the electromagnetic spectrum does it belong?

The wavelength of $X$-ray is $1.5 \times 10^{-10} \ m$. Find the frequency.

What is the photoelectric effect? Explain it.

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