D. Both b and c is the answer
Q is a concave mirror.
Explanation:
The image formed by a concave mirror is observed to be virtual, erect and larger than the object.
Answer : The energy released in first step of thorium-232 decay chain is 
Explanation :
First we have to calculate the mass defect 
.
The balanced reaction is,
Mass defect = Sum of mass of product - sum of mass of reactants
conversion used : 
Now we have to calculate the energy released.
The energy released is
Therefore, the energy released in first step of thorium-232 decay chain is
Answer:
a) T = (2,375 ± 0.008) s
, b) When comparing this interval with the experimental value we see that it is within the possible theoretical values.
Explanation:
a) The period of a simple pendulum is
T = 2π √ L / g
Let's calculate
T = 2π √1.40 / 9.8
T = 2.3748 s
The uncertainty of the period is
ΔT = dT / dL ΔL
ΔT = 2π ½ √g/L 1/g ΔL
ΔT = π/g √g/L ΔL
ΔT = π/9.8 √9.8/1.4 0.01
ΔT = 0.008 s
The result for the period is
T = (2,375 ± 0.008) s
b) the experimental measure was T = 2.39 s ± 0.01 s
The theoretical value is comprised in a range of [2,367, 2,387] when we approximate this measure according to the significant figures the interval remains [2,37, 2,39].
When comparing this interval with the experimental value we see that it is within the possible theoretical values.
The product of mass and velocity is momentum. P=mv. The 'P' in the equation stands for momentum.
