# Physics

posted by .

How much energy is released in the beta decay of 14 C?

Since carbon-14 decays into Nitrogen-14,
the mass of carbon 14 is 14.003242 and the mass of nitrogen 14 is 14.003074, What I did was:
(14.003242-14.003074)u * 931.5 MeV/c^2 = (0.156 MeV/c^2)*c^2 = .156 MeV

but that's not the answer, am I doint something wrong?

• Physics -

Did you include the rest energy of the electron emitted in the beta decay process?

You can neglect the neutrino rest mass energy, since its mass is nearly zero. It does carry significant momentum.

• Physics -

You are right, considering the mass of the electron emitted I got .352 MeV, which is the correct answer. Everywhere I looked on the internet said to neglect this mass, but I guess it does make a difference. My answer was negative though, does that mean that I only consider the absolute value of whatever I get?

## Similar Questions

1. ### physics

1)7Be decays with a half-life of about 53 d. It is produced in the upper atmosphere, and filters down onto the Earth's surface. If a plant leaf is detected to have 300 decays/s of 7Be, how many days do we have to wait for the decay …
2. ### Chemistry

Methanol burns in oxygen to make carbon dioxide and water. The equation is exothermic, with 1452kJ/mol. of energy being released. (a)Write a balanced equation for the combustion of methanol. -methanol+oxygen=carbon dioxide+water -CH3OH+O2=CO2+H2O …
3. ### Chemistry

A 3.000 gram sample of an unknown compound containing the elements carbon, hydrogen, and nitrogen is analyzed by combustion. The combustion releases 4.714 grams of carbon dioxide and 1.500 grams of nitrogen. If 25 molecules have a …
4. ### science help?

(a) One such reaction fuses two nuclei of carbon-12 ( 6 12C ) to form an atom of neon ( 10 20Ne ) with the emission of an α-particle. Write an equation for this process, indicating the atomic number and mass number of each of …
5. ### phisic

(a) One such reaction fuses two nuclei of carbon-12 (12/6C ) to form an atom of neon (20/10Ne ) with the emission of an α-particle. Write an equation for this process, indicating the atomic number and mass number of each of the …
6. ### Astronomy

One possible energy source for the mysterious object you've just discovered is the fusion of hydrogen to form carbon-12 (the most common and stable isotope of Carbon). Hydrogen has an atomic mass of 1.00794 u, while carbon has an atomic …
7. ### Science

Choose the explanation that does the following: (1) identifies the element used in carbon dating and (2) explains why the element is used. A. iodine-131; iodine is present in the thyroid glands, is radioactive, and has a very long …