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. 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/CACDCHCLkjHVo-t5jNQRKUubq8%3DL8L_z8szaKasMeu5jnd1iYHA%40mail.gmail.com.
