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Current Electricity

Question
CBSEENPH12039945
Wired Faculty App

The energy of the EM waves is of the order of 15 keV. To which part of the spectrum does it belong?

  • X - rays

  • infrared rays

  • Ultraviolet rays

  • gamma -rays

Solution

A.

X - rays

 Given, energy of EM waves is of the order of 15 keV
straight E space equals space hc over straight lambda rightwards double arrow space straight E space equals space fraction numerator 6.626 space straight x space 10 to the power of negative 34 end exponent space straight x space 3 space straight x space 10 to the power of 18 space over denominator 15 space straight x space 10 cubed space straight x space 1.6 space straight x space 10 to the power of 19 end fraction equals space fraction numerator 1.3248 space space straight x space 10 to the power of negative 29 end exponent over denominator 1.6 space straight x space 10 to the power of negative 19 end exponent end fraction space equals space 0.828 space straight x space 10 to the power of negative 10 end exponent space straight m equals space 0.828 stack space straight A with straight o on top


thus, this spectrum is a part of X -rays

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