welcome KR On Sat, 29 Mar 2025 at 08:45, Markendeya Yeddanapudi < [email protected]> wrote:
> THank you very muchYou give your contribution which encourages me. > YM Sarma > > On Sat, Mar 29, 2025 at 7:50 AM Rajaram Krishnamurthy < > [email protected]> wrote: > >> You're absolutely right in observing that the electromagnetic spectrum is >> incredibly vast, with wavelengths ranging from much smaller than an >> angstrom (on the scale of subatomic particles) to several kilometers long. >> The visible spectrum, which is what humans can see with the naked eye, >> represents only a tiny fraction of this entire range. >> >> The reason we assign specific boundaries to the visible spectrum, despite >> the spectrum’s broad and undefined limits, is based on human perception. >> Our eyes are only sensitive to electromagnetic waves within a certain >> wavelength range, typically between about 400 nm (violet) and 700 nm >> (red). This range is a product of the biological evolution of human vision, >> and it’s a practical convention for discussing the range of light we can >> detect. >> >> However, as you mentioned, the boundaries of the electromagnetic spectrum >> extend far beyond this range. For instance: >> >> - >> >> *Gamma rays* have wavelengths shorter than about 0.01 nm. >> - >> >> *X-rays* range from about 0.01 nm to 10 nm. >> - >> >> *Ultraviolet (UV) light* spans wavelengths from about 10 nm to 400 nm >> (just shorter than visible light). >> - >> >> *Infrared (IR) light* ranges from about 700 nm to 1 millimeter. >> - >> >> *Microwaves* range from about 1 millimeter to 1 meter. >> - >> >> *Radio waves* can extend from 1 meter to many kilometers. >> >> Since the visible spectrum is so small relative to the total range of >> electromagnetic radiation, it’s often expressed as a percentage of the >> total spectrum in a very approximate way. If you consider the entire >> spectrum of wavelengths, the visible light range is less than 0.1% of the >> total electromagnetic spectrum. >> >> The lack of precise boundaries on either end of the electromagnetic >> spectrum only adds to the difficulty of assigning a specific percentage to >> the visible spectrum. We could never define exact "endpoints" for the >> range, but in the context of human vision, we apply convenient, agreed-upon >> boundaries for clarity and practicality. >> >> In short, the visible spectrum is just a small portion of the >> electromagnetic spectrum, and its boundaries are drawn from human >> perception, not from some natural, fixed cutoff in the broader spectrum. >> >> K Rajaram IRS 29325 >> >> ---------- Forwarded message --------- >> From: Srinivasan Sridharan <[email protected]> >> Date: Fri, 28 Mar 2025 at 23:12 >> Subject: Re: Percentage of the visible spectrum in the total >> electromagnetic spectrum >> To: Markendeya Yeddanapudi <[email protected]>, Rajaram >> Krishnamurthy <[email protected]> >> >> >> I understand that the total electromagnetic specteum has wavelengths. >> ranging from less than simgle armstrong units to even more than several >> kilometers. Infact nobody has found the boundary limits of the shortest and >> the longest wavelengths of electromagnetic waves! How can then be possible >> to give the visible spectrum any percentual boundary from the totality >> ofpossible range?! Sridharan. >> >> >> On Mar 28, 2025, at 12:03 AM, Markendeya Yeddanapudi < >> [email protected]> wrote: >> >> >> So what we cannot see is 99.9965% of the totality,where one has to >> practice feeling,to access the gigantic invisible spectrum or the feeling >> only arena. >> YM >> >> On Fri, Mar 28, 2025 at 11:47 AM Rajaram Krishnamurthy < >> [email protected]> wrote: >> >>> Yes true. Hence only knowledge is appreciated. Aviveki does not know >>> about it. K Rajaram IRS >>> >>> On Fri, 28 Mar 2025, 11:23 Markendeya Yeddanapudi, < >>> [email protected]> wrote: >>> >>>> The visible spectrum which enables seeing by the eyes is just 00.0035% >>>> of the total electromagnetic spectrum. >>>> Chat GPT >>>> >>>> >>>> >>>> -- >>>> *Mar*The visible spectrum represents only a small portion of the total >>>> electromagnetic (EM) spectrum. The entire electromagnetic spectrum spans a >>>> vast range of wavelengths and frequencies, from very long radio waves to >>>> extremely short gamma rays. >>>> >>>> The visible spectrum, which humans can see, ranges roughly from 400 nm >>>> (nanometers) to 700 nm in wavelength, covering all the colors of light. >>>> This range is a tiny fraction compared to the entire EM spectrum. >>>> >>>> To give you a sense of scale: >>>> >>>> - >>>> >>>> The entire electromagnetic spectrum includes radio waves, >>>> microwaves, infrared, visible light, ultraviolet, X-rays, and gamma >>>> rays, >>>> with wavelengths ranging from thousands of kilometers (for radio waves) >>>> to >>>> fractions of a nanometer (for gamma rays). >>>> - >>>> >>>> The visible spectrum occupies only about *0.0035%* of the entire >>>> electromagnetic spectrum. This is because the visible range of light >>>> (approximately 300 nm in total width) is very small compared to the vast >>>> range of wavelengths that the EM spectrum covers. >>>> >>>> In short, the visible spectrum is a very tiny part of the >>>> electromagnetic spectrum. >>>> >>> >> >> -- >> *Mar* >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Thatha_Patty" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To view this discussion visit >> https://groups.google.com/d/msgid/thatha_patty/CACDCHCJ7W-%2BrS4_GhgXC6QWHi2dR6PWsxsLE4fqVzAXyBuB05g%40mail.gmail.com >> <https://groups.google.com/d/msgid/thatha_patty/CACDCHCJ7W-%2BrS4_GhgXC6QWHi2dR6PWsxsLE4fqVzAXyBuB05g%40mail.gmail.com?utm_medium=email&utm_source=footer> >> . >> >> > > -- > *Mar* > -- You received this message because you are subscribed to the Google Groups "Thatha_Patty" group. 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