Answer:
option (c) is correct
Explanation:
Half life of a substance is the time in which the element becomes half of is initial value.
half life, T = 8 days
Amount remaining, N = 10 % of original value
Let the original value is No.
N = 10% of No
N = 0.1 No
Let the time taken is t and the decay constant is λ.
The relation between the decay constant and the half life is given by

Us the equation of radioactivity



Taking natural log on both the sides, we get
0.08664 t = 2.303
t = 26.6 days
Lakes and rivers can be formed landforms from water
There's no rule like that. A glass mirror is opaque but reflects
more light than a clean transparent glass window does.
On the other hand, a material that's transparent but shiny may
reflect more light than an opaque material that's painted black.
You can't give any general rule.
Answer:
Another ship travels at an average velocity of 26 km/h for
Explanation: