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The atmospheric layer which reflects radio waves is called
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A
ionosphere
💡 Explanation:
The ionosphere, located between 60-1000 km altitude, contains ionized particles that reflect radio waves back to Earth, enabling long-distance radio communication. The exosphere (A) is too thin, stratosphere (C) contains ozone but doesn't reflect radio waves well, and troposphere (D) is where weather occurs but doesn't reflect radio waves.