U-236 is an important neutron poison in reactors that is created
in uraniumbased fuels from U-235 capturing a neutron. Derive an
expression for the time at which the peak U-236 concentration
occurs. Note that not all neutron absorption by U-235 becomes
U-236; some U-235 atoms fission.
A neutron hits U 235 which then splits into a Cs 140 atom
(139.91728u), a Rb 93 atom (92.92204u), and several neutrons. How
many grams of U 235 do we need to start with to produce 1.3 x 10^9
J?
Q1)
What is the type of decay ( or nuclear decay reaction ) in diamond
??
Q2)
name just the steps of producing ethanol from Each of the a and
b
a)
from alcoholic fermentation ?
b)
from gasification or syngas ?
The half-life for the radioactive decay of U−238U−238 is 4.5
billion years and is independent of initial concentration.
Part A
How long will it take for 20% of the U−238 atoms in a sample of
U−238 to decay?
Express your answer using two significant figures.
Part B
If a sample of U−238 initially contained 1.1×1018
atoms when the universe was formed 13.8 billion years ago, how many
U−238 atoms will it contain today?
Express your answer using two significant figures.
1a Describe how thermal energy is obtained by
fission, specifically when a U=235 atom is hit by a slow-motion
neutron (less than 0.9 MeV). When one states that 200 MeV of energy
are released by a fission event, what is the form of this
energy?
1b. The energy released by fission is by the
change in mass and Einstein’s equation (E=Δmc2). If the
mass of one uranium 235 atom is 235.042924 amu and the mass of
fission products is 234.92754...
The following are
the P/E ratios, growth rates, beta and payout ratios of some firms
in the same industry
Company
P/E Ratio
Growth rate
Beta
Payout
BOE
17.3
3.50%
1.1
28%
GD
15.5
11.50%
1.25
40%
GMH
16.5
13.00%
0.85
41%
GRU
11.4
10.50%
0.8
37%
LK
10.2
9.50%
0.85
37%
LG
12.4
14.00%
0.85
11%
LR
13.3
16.50%
0.75
23%
MM
11
8.00%
0.85
22%
MD
22.6
13.00%
1.15
37%
NR
9.5
9.00%
1.05
47%
RY
12.1
9.50%
0.75...
a) Radon undergoes alpha decay with a half-life of 3.8 days.
What is its decay constant in s-1?
b) Sr -90 (A=90, Z = 38) decays via β- decay.
Calculate the energy of the antineutrino (in keV) if the beta
particle has a kinetic energy of 397 keV. Note - you can look the
atomic masses up online.
c) What is the average binding energy per nucleon for Argon-40
(A=40, Z = 18) in MeV/nucleon? Note - keep 4 significant...