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

  • A
    $2 \times 10^{18} \ Hz$
  • B
    $2 \times 10^{17} \ Hz$
  • C
    $4.5 \times 10^{-2} \ Hz$
  • D
    $0.5 \times 10^{18} \ Hz$

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