{"id":655,"date":"2009-07-23T05:00:37","date_gmt":"2009-07-23T05:00:37","guid":{"rendered":"http:\/\/xromata.com\/?p=655"},"modified":"2017-06-20T09:53:17","modified_gmt":"2017-06-20T09:53:17","slug":"%ce%bc%ce%bf%ce%bd%ce%ac%ce%b4%ce%b5%cf%82-%ce%bc%ce%ad%cf%84%cf%81%ce%b7%cf%83%ce%b7%cf%82-%ce%b7%ce%bb%ce%b5%ce%ba%cf%84%cf%81%ce%bf%ce%bc%ce%b1%ce%b3%ce%bd%ce%b7%cf%84%ce%b9%ce%ba%cf%8e%ce%bd","status":"publish","type":"post","link":"https:\/\/xromata.com\/?p=655","title":{"rendered":"\u039c\u03bf\u03bd\u03ac\u03b4\u03b5\u03c2 \u03bc\u03ad\u03c4\u03c1\u03b7\u03c3\u03b7\u03c2 \u03b7\u03bb\u03b5\u03ba\u03c4\u03c1\u03bf\u03bc\u03b1\u03b3\u03bd\u03b7\u03c4\u03b9\u03ba\u03ce\u03bd \u03ba\u03c5\u03bc\u03ac\u03c4\u03c9\u03bd – Units of wavelength measurement."},"content":{"rendered":"

 <\/p>\n

Μον\u03acδες μ\u03adτρησης του μ\u03aeκους κ\u03cdματος.<\/o:p><\/font><\/span><\/u><\/p>\n


\n<\/span><\/o:p><\/span><\/u><\/p>\n

\u038cπως \u03aeδη αναφ\u03adραμε <\/span>(<\/span>post<\/span>: ηλεκτρομαγνητικ\u03ac κ\u03cdματα)<\/span> μ\u03aeκος κ\u03cdματος καλε\u03afται η απ\u03ccσταση μεταξ\u03cd δυο διαδοχικ\u03ceν κορυφ\u03ceν εν\u03ccς κ\u03cdματος.<\/o:p><\/span><\/font><\/p>\n

Στο ηλεκτρομαγνητικ\u03cc φ\u03acσμα οι αποστ\u03acσεις αυτ\u03adς διαφ\u03adρουν πολ\u03cd.<\/o:p><\/font><\/span><\/p>\n

Στην μια \u03acκρη του φ\u03acσματος, στην πλευρ\u03ac των ραδιοκυμ\u03acτων, οι αποστ\u03acσεις μεταξ\u03cd των διαδοχικ\u03ceν κορυφ\u03ceν των κυμ\u03acτων ε\u03afναι τερ\u03acστιες και μετριο\u03cdνται σε δεκ\u03acδες χιλιομ\u03adτρων, εν\u03ce στην \u03acλλη πλευρ\u03ac, προς τις ακτ\u03afνες γ\u03acμμα τα μ\u03aeκη κ\u03cdματος ε\u03afναι απειροελ\u03acχιστα μικρ\u03ac.<\/o:p><\/font><\/span><\/p>\n

Το ορατ\u03cc φως, με τις χρωματικ\u03adς ακτινοβολ\u03afες του, βρ\u03afσκεται περ\u03afπου σε μεσα\u03afες τιμ\u03adς, που ε\u03afναι και αυτ\u03adς πολ\u03cd μικρ\u03adς για τα ανθρ\u03ceπινα μ\u03adτρα.<\/o:p><\/font><\/span><\/p>\n

Οι τιμ\u03adς αυτ\u03adς κυμα\u03afνονται μεταξ\u03cd 760 και 380 νανομ\u03adτρων (<\/span>nm<\/span>), \u03ae \u03acλλως μεταξ\u03cd 7500 και 3500 μον\u03acδων \u0386νγκστρομ (\u01fa).<\/o:p><\/span><\/font><\/p>\n

Για να καταλ\u03acβουμε την μικρ\u03ccτητα των μεγεθ\u03ceν αυτ\u03ceν ας αναλογισθο\u03cdμε \u03ccτι \u03adνα ναν\u03ccμετρο αντιστοιχε\u03af προς <\/span>10-9 <\/sup><\/font> <\/span>μ\u03adτρου, εν\u03ce μια μον\u03acδα \u0386νγκστρομ ισοδυναμε\u03af προς <\/span>10-8 <\/sup><\/font>του εκατοστ\u03ccμετρου, \u03aeτοι το \u03adνα εκατομμυριοστ\u03cc του εκατοστ\u03ccμετρου και χρησιμοποιε\u03afται ειδικ\u03ac για να προσδιορ\u03afζει μ\u03aeκη κ\u03cdματος ακτινοβολι\u03ceν.<\/o:p><\/span><\/font><\/p>\n

Οι τιμ\u03adς \u01fa στις οπο\u03afες κυμα\u03afνονται τα δι\u03acφορα χρ\u03ceματα ε\u03afναι περ\u03afπου οι εξ\u03aeς:<\/o:p><\/font><\/span><\/p>\n

4000 \u01fa μωβ<\/span><\/o:p><\/font><\/span><\/p>\n

4500 \u01fa μπλε<\/span><\/o:p><\/font><\/span><\/p>\n

5500 \u01fa πρ\u03acσινο<\/span><\/o:p><\/font><\/span><\/p>\n

6000 \u01fa κ\u03afτρινο<\/span><\/o:p><\/font><\/span><\/p>\n

6500 \u01fa πορτοκαλ\u03af<\/span><\/o:p><\/font><\/span><\/p>\n

7000 \u01fa κ\u03ccκκινο<\/span><\/o:p><\/font><\/span><\/p>\n

 <\/font><\/o:p><\/span><\/p>\n

Θυμ\u03afζω πως \u03ccσο μεγαλ\u03ceνει το μ\u03aeκος κ\u03cdματος (η απ\u03ccσταση μεταξ\u03cd δυο διαδοχικ\u03ceν κορυφ\u03ceν του κ\u03cdματος) τ\u03ccσο μικρα\u03afνει η συχν\u03ccτητα του κ\u03cdματος (ο <\/span>αριθμ\u03ccς των κορυφ\u03ceν των κυμ\u03acτων που περνο\u03cdν απ\u03cc \u03adνα σημε\u03afο αν\u03ac δευτερ\u03ccλεπτο).<\/o:p><\/span><\/font><\/p>\n

Δηλαδ\u03ae, αν π\u03acρουμε τα δυο ακρα\u03afα βασικ\u03ac χρ\u03ceματα κ\u03ccκκινο<\/span> και μπλε<\/span>, βλ\u03adπουμε πως η κ\u03ccκκινη ακτινοβολ\u03afα<\/span> \u03adχει μεγ\u03acλο μ\u03aeκος κ\u03cdματος και μικρ\u03ccτερη συχν\u03ccτητα (ισχ\u03cd). Εν αντιθ\u03adσει η μπλε ακτινοβολ\u03afα<\/span> εν\u03ce \u03adχει μικρ\u03ccτερο μ\u03aeκος κ\u03cdματος, \u03adχει μεγαλ\u03cdτερη συχν\u03ccτητα (ισχ\u03cd).<\/o:p><\/span><\/font><\/span><\/p>\n

 <\/font><\/o:p><\/span><\/p>\n

\n\n\n\n\n\n\n\n
\n

Μον\u03acδες μ\u03adτρησης<\/span><\/o:p><\/font><\/font><\/b><\/p>\n<\/td>\n<\/tr>\n

\n

μον\u03acς<\/font><\/b><\/p>\n<\/td>\n

\n

σ\u03cdμβολο<\/font><\/b><\/p>\n<\/td>\n

\n

μ\u03aeκος<\/font><\/b><\/p>\n<\/td>\n<\/tr>\n

\n

centimeter<\/font><\/p>\n<\/td>\n

\n

cm<\/font><\/p>\n<\/td>\n

\n

10-2<\/sup> meters<\/font><\/p>\n<\/td>\n<\/tr>\n

\n

Angstrom<\/font><\/p>\n<\/td>\n

\n

<\/v:stroke><\/v:f><\/v:f><\/v:f><\/v:f><\/v:f><\/v:f><\/v:f><\/v:f><\/v:f><\/v:f><\/v:f><\/v:f><\/v:formulas><\/v:path><\/o:lock><\/v:shapetype><\/v:imagedata><\/v:shape><\/span><\/p>\n

\u01fa<\/font><\/span><\/td>\n

\n

10-8<\/sup> centimeters<\/font><\/p>\n<\/td>\n<\/tr>\n

\n

nanometer<\/font><\/p>\n<\/td>\n

\n

nm<\/font><\/p>\n<\/td>\n

\n

10-9<\/sup> meters<\/font><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

 <\/font><\/o:p><\/span><\/p>\n

 <\/p>\n

 <\/p>\n

<\/p>\n

<\/p>\n

Units of wavelength measurement<\/span><\/u><\/span>.<\/span><\/u><\/span><\/span><\/span><\/p>\n


\n<\/span><\/span><\/u><\/span><\/p>\n

As we have already mentioned (post: electromagnetic waves) wavelength is called the distance between two successive peaks of a wave.<\/span><\/span><\/span><\/p>\n

In the electromagnetic spectrum these distances differ greatly. <\/span><\/span><\/span><\/p>\n

At <\/span>the <\/span>one end of the spectrum, on the radio wave’s side, the distances between successive wave peaks are enormous and measured in tens of kilometers, while on the other side, to the gamma rays, are infinitely small.<\/span><\/span><\/span><\/p>\n

Visible light, with its color radiations, is at about mid-range, which is also very small for human measures.<\/span><\/span><\/span><\/p>\n

These values range from 760 to 380 nanometers (nm), or alternatively between 7500 and 3500 Angstrom units (\u01fa).<\/span><\/span><\/span><\/p>\n

To understand the smallness of these measurements, let us consider that a nanometer corresponds to <\/span>10-9<\/sup><\/span> meters, while an Angstrom unit is equivalent to <\/span>10-8<\/sup><\/span> centimeters, that is one millionth of a centimeter, and is specifically used to determine wavelengths of radiation.<\/span><\/span><\/span><\/p>\n

The \u01fa values in which the various colors vary are approximately the following:
\n4000 \u01fa violet<\/span><\/span><\/span><\/p>\n

4500 \u01fa blue<\/span><\/span><\/span><\/p>\n

5500 \u01fa green<\/span><\/span><\/span><\/p>\n

6000 \u01fa yellow<\/span><\/span><\/span><\/p>\n

6500 \u01fa orange<\/span><\/span><\/span><\/p>\n

7000 \u01fa red<\/span><\/span><\/span><\/p>\n

I recall that as the wavelength increases (the distance between two consecutive wave peaks), the wave frequency (the number of wave peaks passing one point per second) decreases.<\/span><\/span><\/span><\/p>\n

That is, if we get the two extreme basic colors red and blue, we see that red radiation has a long wavelength and a lower frequency (power). In contrast, blue radiation while having a shorter wavelength, has a higher frequency (power).<\/span><\/span><\/span><\/p>\n

 <\/span><\/span><\/span><\/span><\/p>\n

 <\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

  Μον\u03acδες μ\u03adτρησης του μ\u03aeκους κ\u03cdματος. \u038cπως \u03aeδη αναφ\u03adραμε (post: ηλεκτρομαγνητικ\u03ac κ\u03cdματα) μ\u03aeκος κ\u03cdματος καλε\u03afται η απ\u03ccσταση μεταξ\u03cd δυο διαδοχικ\u03ceν κορυφ\u03ceν εν\u03ccς κ\u03cdματος. Στο ηλεκτρομαγνητικ\u03cc φ\u03acσμα οι αποστ\u03acσεις αυτ\u03adς διαφ\u03adρουν πολ\u03cd. Στην μια \u03acκρη του φ\u03acσματος, στην πλευρ\u03ac των ραδιοκυμ\u03acτων, οι αποστ\u03acσεις μεταξ\u03cd των διαδοχικ\u03ceν κορυφ\u03ceν των κυμ\u03acτων ε\u03afναι τερ\u03acστιες και μετριο\u03cdνται σε δεκ\u03acδες χιλιομ\u03adτρων, […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16,13],"tags":[35,187,37,56,68,170,55,59,186,58,57,461],"class_list":["post-655","post","type-post","status-publish","format-standard","hentry","category-arithmoi-kai-xromata","category-hilectromagnitiko-fasma-kai-fws","tag-aktinovolia","tag-187","tag-electomagnitiko-fasma","tag-kitrino","tag-68","tag-170","tag-ble","tag-mwv","tag-186","tag-portokali","tag-prasino","tag-fos"],"_links":{"self":[{"href":"https:\/\/xromata.com\/index.php?rest_route=\/wp\/v2\/posts\/655","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/xromata.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/xromata.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/xromata.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/xromata.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=655"}],"version-history":[{"count":8,"href":"https:\/\/xromata.com\/index.php?rest_route=\/wp\/v2\/posts\/655\/revisions"}],"predecessor-version":[{"id":9279,"href":"https:\/\/xromata.com\/index.php?rest_route=\/wp\/v2\/posts\/655\/revisions\/9279"}],"wp:attachment":[{"href":"https:\/\/xromata.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=655"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/xromata.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=655"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/xromata.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=655"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}