It depends on the size, material, shape, etc.
Answer:
The velocity is 
.
Explanation:
Given that,
Charge density of the plane 
Distance = 1.05 mm
We need to calculate the electric field due to plane of charge
Using formula of electric field
Put the value into the formula
We need to calculate potential difference
Using formula of potential difference
Put the value into the formula
We need to calculate the work requires to be done to reach the surface of the plane
Using formula of work done
Put the value into the formula
We need to calculate the velocity
Using work energy theorem
Hence, The velocity is .
Answer:
a)143.8 decays/minute
b)0.41 decays/minute
Explanation:
From;
0.693/t1/2 = 2.303/t log (Ao/A)
Where;
t1/2=half-life of C-14= 5670 years
t= time taken to decay
Ao= activity of a living sample
A= activity of the sample under study
a)
0.693/5670 = 2.303/1000 log(162.5/A)
1.22×10^-4 = 2.303×10^-3 log(162.5/A)
1.22×10^-4/2.303×10^-3 = log(162.5/A)
0.53 × 10^-1 = log(162.5/A)
5.3 × 10^-2 = log(162.5/A)
162.5/A = Antilog (5.3 × 10^-2 )
A= 162.5/1.13
A= 143.8 decays/minute
b)
0.693/5670 = 2.303/50000 log(162.5/A)
1.22×10^-4 = 4.61×10^-5 log(162.5/A)
1.22×10^-4/4.61×10^-5 = log(162.5/A)
0.26 × 10^1 = log(162.5/A)
2.6= log(162.5/A)
162.5/A = Antilog (2.6 )
A= 162.5/398.1
A= 0.41 decays/minute
Answer:
b) The more could in the solenoid of the primary loop of a transformer will induce a greater emf in the secondary loop.
Explanation:
I think what that option was saying was the closer to the magnet the solenoid is, the faster it is going and the greater is the magnetic field due to the magnet in the vicinity of the solenoid, so the emf increases.
Too bad roosters don't lay eggs
