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Class 12 Exam  >  Class 12 Questions  >  Visible range of electromagnetic spectrum isa... Start Learning for Free
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Visible range of electromagnetic spectrum is
  • a)
    400 m to 0.6 m
  • b)
    400 mm to 0.6 mm
  • c)
    400 nm to 0.6 mm
  • d)
    400 µm to 0.6 µm
Correct answer is option 'C'. Can you explain this answer?
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Visible range of electromagnetic spectrum isa)400 m to 0.6 mb)400 mm t...
The visible light spectrum is the segment of the electromagnetic spectrum that the human eye can view. More simply, this range of wavelengths is called visible light. Typically, the human eye can detect wavelengths from 380 to 700 nanometers.
Option C is the closest so the answer is option C.
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Community Answer
Visible range of electromagnetic spectrum isa)400 m to 0.6 mb)400 mm t...
Nm to 700 nm
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Read the following text and answer the following questions on the basis of the same:Laser:Electromagnetic radiation is a natural phenomenon found in almost all areas of daily life, from radio waves to sunlight to x-rays. Laser radiation – like all light – is also a form of electromagnetic radiation. Electromagnetic radiation that has a wavelength between 380 nm and 780 nm is visible to the human eye and is commonly referred to as light. At wavelengths longer than 780 nm, optical radiation is termed infrared (IR) and is invisible to the eye. At wavelengths shorter than 380 nm, optical radiation is termed ultraviolet (UV) and is also invisible to the eye. The term “laser light” refers to a much broader range of the electromagnetic spectrum that just the visible spectrum, anything between 150 nm up to 11000 nm (i.e. from the UV up to the far IR). The term laser is an acronym which stands for “light amplification by stimulated emission of radiation”.Einstein explained the stimulated emission. In an atom, electron may move to higher energy level by absorbing a photon. When the electron comes back to the lower energy level it releases the same photon. This is called spontaneous emission. This may also so happen that the excited electron absorbs another photon , releases two photons and returns to the lower energy state. This is known as stimulated emission.Laser emission is therefore a light emission whose energy is used, in lithotripsy, for targeting and ablating the stone inside human body organ.Apart from medical usage, laser is used for optical disk drive, printer, barcode reader etc.Q. What is the range of amplitude of LASER?

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Visible range of electromagnetic spectrum isa)400 m to 0.6 mb)400 mm to 0.6 mmc)400 nm to 0.6 mmd)400 µm to 0.6 µmCorrect answer is option 'C'. Can you explain this answer?
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