Post if you are interested. Paying 100fg per questions. 4 Questions.

This post was edited by Stolem on Dec 16 2013 12:23am

Post questions. I may be able to help out, maybe not on all.

you blocked me lol

This post was edited by nlin on Dec 16 2013 09:16pm

must have misclicked, my bad.


still need. Stuck on 2 last problems.

This post was edited by Stolem on Dec 17 2013 01:26am

post here ?

Post them

EE <---

still need..

50fg each for these.

#12
What is the minimum uncertainty in the speed of an electron that is known to be somewhere between 0.050nm and 0.20nm from a proton?
Express your answer using two significant figures.


#21
A particular radioactive sample undergoes 1.70×106decays/s .
Part A
What is the activity of the sample in curies?
R= ____ Ci

Part B
What is the activity of the sample in becquerels?
Correct answer is R= 1.70*10^6 Bq


100fg each for these.


#32
Part A
Calculate the energy released by the electron-capture decay of 5727Co. Consider only the energy of the nuclei (ignore the energy of the surrounding electrons). The following masses are given:
5727Co: 56.936296u
5726Fe: 56.935399u
Express your answer in millions of electron volts (1u=931.5MeV/c2) to three significant figures.
Correct answer: 0.836 MeV

Part B
A negligible amount of this energy goes to the resulting 5726Fe atom as kinetic energy. About 90 percent of the time, after the electron-capture process, the 5726Fe nucleus emits two successive gamma-ray photons of energies 0.128MeV and 1.60×10−2MeV in decaying to its ground state. The electron-capture process itself emits a massless neutrino, which also carries off kinetic energy. What is the energy of the neutrino emitted in this case?
Express your answer in millions of electron volts.
= ___ MeV

#39
Part A
How much energy (to four significant figures) would be required to completely separate all the nucleons of a beryllium-9 nucleus, the atom of which has a mass of 9.0122u ?
Express your answer using four significant figures.
Eb = ___MeV

Part B
Compute the average binding energy per nucleon of this nuclide.
Express your answer using four significant figures.

Eb / A = ___MeV / nucleon

This post was edited by Stolem on Dec 19 2013 10:00am

#17
In a diagnostic procedure, a patient in a hospital ingests 60mCi of gold-198 (t1/2=2.7days).
What is the activity at the end of one month, assuming none of the gold is eliminated from the body by biological functions?
Express your answer using two significant figures.
Δv≥ = ___m/s

30 days = 1 month
half lives = (30/2.7) = 11.1111
gold source left = 60 * ( 1/2)^11.11 = .027146 mCi OR 27 uCi

This post was edited by JDota72 on Dec 19 2013 10:09am

#27
"Maximum power, Scotty!" The starship Enterprise, of television and movie fame, is powered by a controlled combination of matter and antimatter.

If the antimatter fuel supply of the Enterprise, with a total mass of 360kg , combines with matter, how much energy is released?
Use c=2.998×108 meters per second for the speed of light in vacuum. Express your answer numerically, in joules, to three significant figures.

so we know overall mass (antimatter+matter) = 360 kg x 2 = 720 kg
E = 720 x (2.998x10^8)^2 = 6.47 x 10^19 J