Trick –– "GAP DAL D"
• G = GAMA RAYS
• A = ALFA RAYS
• P = PARABAIGANI KIRNE (ULTRA-VIOLET RAYS)
• D = DRUSHYA VIKIRAN (VISIBLE RADIATION)
• A = AVRAKT VIKIRAN (INFRA-RED RAYS)
• L = LAGHU REDIO TARANG (SHORT REDIO WAVES OR HERTZ HERTZIAN WAVES)
• D = DIRGH REDIO TARANG (LONG REDIO WAVES)
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