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Class 12 Exam  >  Class 12 Questions  >  The energy of the em waves is of the order of... Start Learning for Free
The energy of the em waves is of the order of 15 keV. To which part of the spectrum does it belong?​
  • a)
    ultraviolet-rays
  • b)
    infrared-rays
  • c)
    X-rays
  • d)
    gamma-rays
Correct answer is option 'C'. Can you explain this answer?
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The energy of the em waves is of the order of 15 keV. To which part of...
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The energy of the em waves is of the order of 15 keV. To which part of...
Explanation:

Electromagnetic waves are classified according to their frequency or wavelength. The different types of electromagnetic waves are radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays. The energy of electromagnetic waves increases as the frequency increases.

The energy of electromagnetic waves can be calculated using the formula:

E = hf

where E is the energy, h is Planck's constant, and f is the frequency.

For the given question, the energy of the electromagnetic waves is 15 keV. The energy can be converted to frequency using the above formula.

E = 15 keV = 15 x 10^3 eV = 1.5 x 10^4 eV

h = 6.626 x 10^-34 J s = 4.136 x 10^-15 eV s

f = E/h = (1.5 x 10^4 eV)/(4.136 x 10^-15 eV s) = 3.63 x 10^18 Hz

The frequency of the electromagnetic waves is 3.63 x 10^18 Hz. This frequency corresponds to X-rays.

Therefore, the correct answer is option 'C', X-rays.

Summary:

- Electromagnetic waves are classified according to their frequency or wavelength.
- The energy of electromagnetic waves increases as the frequency increases.
- The energy of electromagnetic waves can be calculated using the formula E = hf.
- The energy of the given electromagnetic waves is 15 keV.
- The frequency of the electromagnetic waves is 3.63 x 10^18 Hz.
- This frequency corresponds to X-rays.
- Therefore, the correct answer is option 'C', X-rays.
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The energy of the em waves is of the order of 15 keV. To which part of the spectrum does it belong?​a)ultraviolet-raysb)infrared-raysc)X-raysd)gamma-raysCorrect answer is option 'C'. Can you explain this answer?
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