Elektroenergetika va fizika

II – topshiriq. Quyidagi masalalarni yeching. 

 

1-masala .Qanday radioaktiv yemirilish  natijasida   

94

 Pu

239

  plutoniy  

92

U

235

 uranga 

aylanadi?                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                

2 – masala.

27

 Со

60

 radioaktiv kobalьtning o’rtacha yashash vaqti 7,35 yil yarim 

yemirilish davri qanday?