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प्रश्न
WRITE SHORT ANSWER
What is radioactivity?
उत्तर
Radioactivity is the phenomena in which certain substances emit radiations spontaneously.
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क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
WRITE SHORT ANSWER
What is radioactivity?
Radioactivity is the phenomena in which certain substances emit radiations spontaneously.