The radioactive isotopes are formed by neutrons bombardment on the nucleus, these incident neutrons must have ___ to penetrate in the nucleus.
تابکار آاسوٹوپس نیوٹران کی نیوکلئس پر بمباری سے بنتے ہیں، ان واقعاتی نیوٹرانوں کو نیوکلئس میں گھسنے کے لیے ___ ہونا ضروری ہے۔
Answer: Very high velocity
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