Name the electro-magnetic waves with their frequency range, produced in (a) some radioactive decay (b) sparks during electric welding (c) TV remote
a) Gamma rays (1019 to 1024 Hz)
b) UV rays (1015 to 1017 Hz)
c) Infrared rays (1012 to 1014 Hz)
CBSE practical exams 2026 will be cancelled over non-compliance with guidelines, says board
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