Answer:
but for helping we need yr ques nd they r not here
25? this question makes no sense lol
Answer:
The correct answer is "53.15 days".
Explanation:
Given that:
Half life of
,

- Let the initial activity be "
". - and, activity to time t be "R".
To find t when R will be "1%" of
, then
⇒ 
As we know,
⇒ 
or,
∴ 
By putting the values, we get


We know that,
Decay constant, 
hence,
⇒ 


Answer:
nitrogen
The atmosphere contains many gases, most in small amounts, including some pollutants and greenhouse gases. The most abundant gas in the atmosphere is nitrogen, with oxygen second. Argon, an inert gas, is the third most abundant gas in the atmosphere.
Explanation: