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  1. Given a sample of radium-226 having half-life of 4 days. Find the probability,
  2. A source of sound and a detector are moving along the same line with same speed
  3. A nucleus ᵐₙ X emits one α- particle and two β- particles. The resulting nucleus is
  4. If vectors A=cos wti + sin wtj and B= cos wt/2 i + sin wt/2 j are functions of time,
  5. In a region, the potential is represented by V(x,y,z)=6x-8xy-8y+6yz, where V