Answer:
In a velocity selector, there are two forces namely;
» Electric field Intensity
» Magnetic field density
<u>Relationship</u><u>:</u>
![E _{e}= B](https://tex.z-dn.net/?f=E%20_%7Be%7D%3D%20B)
E is the electric field intensity
B is the magnetic flux density
Answer is C. All of the others are internal/molecular changes.
Heat required to change the phase of ice is given by
Q = m* L
here
m = mass of ice
L = latent heat of fusion
now we have
m = 45 kg
L = 334 KJ/kg
now by using above formula
![Q = 45 * 334 * 10^3](https://tex.z-dn.net/?f=Q%20%3D%2045%20%2A%20334%20%2A%2010%5E3)
![Q = 1.5 * 10^7 J](https://tex.z-dn.net/?f=Q%20%3D%201.5%20%2A%2010%5E7%20J)
In KJ we can convert this as
![Q = 1.5 * 10^4 kJ](https://tex.z-dn.net/?f=%20Q%20%3D%201.5%20%2A%2010%5E4%20kJ)
so the correct answer is D option
Answer:
- the expected value is 8
- the standard deviation is 2.8284
Explanation:
Given the data in the question;
The model N(t), the number of planets found up to time t, as a poisson process,
∴ N(t) has distribution of poisson distribution with parameter (λt)
so
the mean is;
λ = 1 every month = 1/3 per month
E[N(t)] = λt
E[N(t)] = (1/3)(24)
E[N(t)] = 8
Therefore, the expected value is 8
For poisson process, Variance and mean are the same,
Var[N(t)] = Var[N(24)]
Var[N(t)] = E[N(24)]
Var[N(t)] = 8
so the standard deviation will be;
σ[N(24)] = √(Var[N(t)] )
σ[N(24)] = √(8 )
σ[N(24)] = 2.8284
Therefore, the standard deviation is 2.8284