Answer:
It takes 28 days.
Explanation:
Hi there!
The half-life is the time at which the concentration of a substance is halved. For radon, it is 4 days. Then, after 4 days, the amount of radon present in the source will be 1/2 of its original concentration. After another 4 days, the concentration of radon will be half of the half of its original concentration, that is, 1/4 of the amount of radon originally present.
After another 4 days, the concentration will be halved again (1/4 /2 = 1/8) and after another 4 days, it will be halved again (1/8 / 2 = 1/16) and so on.
Then, after n half-lives, the concentration of radon will be reduced by a factor of 1/2ⁿ.
Then, to know how many half-lives it takes for the concentration of radon to be reduced to 1/128 of its original level, let´s solve this equation for n:
1/2ⁿ = 1/128
2ⁿ = 128
log 2ⁿ = log 128
n log 2 = log 128
n = log 128 / log 2
n = 7
After 7 half-lives, the concentration of radon will be reduced by 1/128. Since a half-life is 4 days, 7 half-lives will be (7 · 4) 28 days.
C) Y is the strongest point in the electric field.
Answer:
56.6 m/s
Explanation:
The velocity of an object accelerating at constant acceleration is given by the following SUVAT equation
where
u is the initial velocity
a is the acceleration
t is the time
For the object in the problem,
u = 0 since it starts from rest
is the acceleration
Substituting t = 12.3 s, we find the velocity at that time: