278004 से 107A तरंग दैर्ध्य परास वाले विद्युत-चुम्बकीय तरंग का नाम लिखिए और इसके दो महत्वपूर्ण उपयोग लिखिए। Name the electromagnetic wave of 7800A to 107Awavelength range and write two important uses of it. A Bhar 1999 -ans please
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sorry I don't know the answer because I am in 7th class
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