7800 A से 10 तरंग-दैर्घ्य परास वाले विद्युत-चुम्बकीय तरंग का नाम लिखिए औरइसके दो महत्वपूर्ण उपयोग लिखिए।Name the electromagnetic wave of 7800 A to 1078 wavelength rangeand write two important uses of it.
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