5. A positron e+ combines with an electron e- (assume both are
at rest). How much...
5. A positron e+ combines with an electron e- (assume both are
at rest). How much energy is available (in eV)? Two r's (gamma
rays) emerge. What is the energy of each?
An electron is initially is at rest in a uniform electric field
E in the negative y direction and a uniform magnetic field B in the
negative z direction. Solve the equations of motion given by the
Lorentz Force and show the trajectory of the electron is found
as:
x(t)= (cE / wB) * (wt - sintwt)
y(T)=(cE / wB) * (1 - coswt)
where w=(eB/mc)
An electron with an initial speed of 5.05x10^5 m/s is brought to
rest by an electric field. The charge of an electron is
-1.60x10^-19C and its mass is 9.11x 10^-31 kg.
a) did the electron move into a region of higher electric
potential or lower electric potential? Explain
b) What was the electric potential difference that stopped the
electron?
How will differentiate between mitosis and meiosis? at least 5
differences
PET (positron emission tomography) is often used for the early
detection of cancerous tumors. In this case, radiolabeled glucose
is administered to the patient and its distribution in the body is
monitored by the PET. Can you explain why tracking the distribution
of glucose in the body might help detect a tumor?
6.)How much energy is required to excite a hydrogen atom's
electron from n=2 to n=5?
Enter your answer with 2 significant figures.
Note: Your answer is assumed to be reduced to
the highest power possible.
6 b.) Calculate the wavelength of light that is required to excite
a hydrogen atom's electron from n=2 to n=5?
Enter your answer in meters with 2 significant figures.
Note: Your answer is assumed to be reduced to
the highest power possible.
Part A
Suppose an electron is in the n=6 energy level of a H atom.
How much higher in energy is this electron with respect to the ground state of H
Part B
How much additional energy is required to just remove this excited electron from the H atom?
How much energy is required to accelerate a spaceship with a
rest mass of 107 metric tons to a speed of 0.458
c?
Tries 0/20
Every day our Earth receives 1.55×1022 J energy from
the Sun. If we were able to use 0.85 percent of this energy to
accelerate spaceships, then how many missions would be possible in
one year?
Antiproton of kinetic energy E_k collides (bumps) with a proton
at rest. How much energy is available for the production of new
particles that have a mass.
relativistic calculation is needed and a must!
Count Valence e-
Formula
Electron Geometry
Molecular Geometry
1 N = 5
3 H = 3
8 / 2 = 4 pair
NH3
Tetrahedral
Trigonal pyramidal
H2O
CBr4
SO3 This is not a
polyatomic ion …
No charge!!!
PI3
CH3Cl Carbon is the central atom
NO31-
CO32-
NH4+1
CH4
SO2
n electron (q=-e) completes half of a circular orbit of radius r around a nucleus with Q=+3e.a. How much work is done on the electron as it moves from i to f? Give either a numerical value if you knew the radius. Justify your answer.b. By how much does the electric potential energy change as the electron moves from i to f?c. Is the electron's speed at f greater than, less than, or equal to its speed at i?