Radioactive elements emit
A. Radio waves
B. Infrared waves
C. Ultraviolet waves
D. α, β and γ radiations
Answer: Option D
A. Radio waves
B. Infrared waves
C. Ultraviolet waves
D. α, β and γ radiations
Answer: Option D
The term 'brown air' is used for
A. Acid fumes
B. Photochemical smog
C. Sulphurous smog
D. Industrial smog
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