Answer:
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Explanation:
Answer:
The potential difference across the resistor is 250 volts.
Explanation:
The potential difference
across the ends of the resistor is given by

where
is the current through the resistor and
is is its resistance.
Now, in our case
,
;
therefore, the potential across is


bobo mag isip ayaw mag aral bobi
Explanation:
bobo ka boboboboboob
Answer:
the decay of half of the nuclei only a half-life has passed
, b) in rock time it is 1 108 years
Explanation:
The radioactive decay is given by
N = N₀
If half of the atoms have decayed
½ N₀ = N₀
½ =
₀
Ln 0.5 = - λ t
t = - ln 0.5 /λ
The definition of average life time is
= ln 2 / λ
λ = ln 2 / 
λ = 0.693 / 100 10⁶
λ = 0.693 10⁻⁸ years
We replace
t = -ln 0.5 / 0.693 10⁻⁸
t = 10⁸ years
We see that for the decay of half of the nuclei only a half-life has passed
b) in rock time it is 1 108 years