How do carbon 12 and carbon 13 differ?
1 answer:
Answer:
A) & B)
Explanation:
First, the numbers 12 and 13 represent the <em>atomic mass number</em> of the atoms.
- So, A) is true: thus Carbon12 and Carbon 13 have different mass numbers.
The <em>mass number</em> is equal to the total number of protons and neutrons. Consider that any element has the same number of protons, regardless of the number of neutrons. The number of protons in Carbon is 6.
The amount of neutrons can be calculated by: <em>mass number </em>minus <em>number of protons.</em>
For Carbon 12:
For Carbon 13:
- B) is true, we just proved they have different amounts of neutrons.
In order for the charge of the atom to be neutral, the amount of electrons must be equal to the number of protons (as they have opposite charges). And we now know that the number of protons in Carbon12 and Carbon13 are always the same
- C) is false, the number of electrons is the same in both atoms
The atomic charges in both are neutral, due to the fact that they have the same amount of protons and electrons in both cases. Is only the neutrons (thus the mass numbers)that change
- D) is false, they have equal atomic charges
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Question is incomplete. Missing part:
Find the charge on the capacitor at the following times:
1) t = 0 mu S
2) t = 1 mu S
3) t = 50 mu S
1)
We start by calculating the initial charge on the capacitor. For this, we can use the following relationship:
where
C is the capacitance
Q0 is the initial charge stored
V0 is the initial potential difference across the capacitor
When the capacitor is connected to the battery, we have:
Solving for ,
So, when the battery is disconnected, this is the charge on the capacitor at time t = 0.
2)
To find the charge on the capacitor at any other time t, we use the equation:
where
t is the time
is the resistance
is the capacitance
Therefore, at time , we have:
3)
As before, we use again the equation:
However, here the time to consider is
Substituting into the formula,
Answer:
106.24 kJ.
Explanation:
Given that,
Mass of sample of sand, m = 8 kg
Specific heat of sand, c = 664 J/kg-°C
The temperature changes from 20° C to 40° C. We need to find the change in thermal energy. It is given by :
So, the change in thermal energy is 106.24 kJ.