Only need answers, don't need work shown. --- 1. An electron and a proton are accelerated through the same voltage. The electron’s mass is 0.054386734% of the proton’s. The absolute value of the proton’s and electron’s charge is the same. Their final energies will be given by the product of their charge and the accelerating field determined by the voltage. Which has the longer wavelength? A) electron B) proton C) both the same D) neither has a wavelength E) only the electron behaves like a wave 2. An electron, neutron and a proton have the same momentum. Which has the longest wavelength? A) proton B) electron C) neutron D) all have the same E) none has a wavelength F) the proton and neutron G) only the electron behaves like a wave 3. A car is standing in the middle of the flat horizontal road, broken. The car will remain there at rest because: A) it has too much inertia for the net force to move it B) there are no forces acting on it C) it is in a stable equilibrium D) there is no net force on the car E) it does move, but too slowly to be seen F) it is not at rest, it actually moves really fast, we just move with it so it appears to be at rest 4. There are 2 protons and 2 neutrons in an alpha particle, Why doesn’t the alpha particle burst apart? A) The Coulomb force attracts the protons to the neutrons and holds the alpha particle together. B) The Coulomb force attracts the neutrons to each other and holds the alpha particle together. C) Another force besides the Coulomb force exists inside the alpha particle and holds it together. D) The Coulomb force attracts the protons to each other and holds the alpha particle together. E) Gravity overpowers the Coulomb repulsive force inside the alpha particle F) All of the above are true. G) It is actually unstable, half of the free alpha particles shall actually decay in 15 minutes 5. The microvawes in the microwave oven are designed to have the right amount of energy to A) focus the image on the folds of your brain or other internal organs B) slightly heat up parts of your body with a lot of hydrogen C) excite water molecules to heat water containing substances to higher temperatures D) create very large magnetic fields to get a high-resolution image E) cause radiation sickness F) image nuclei with even number of protons and neutrons 6. An electron is accelerated through a voltage until it has 10 times its initial speed. By what factor has its kinetic energy changed? A) 1/100 B) 1/10 C) 1 (it stays the same) D) 10 E) 100 F) It does not have a kinetic energy G) It only has non-zero momentum H) None of the above I) All of the above
Quantum mechanics and hydrogen atom
Consider an electron of mass m moves with the velocity v in a hydrogen atom. If an electron is at a distance r from the proton, then the potential energy function of the electron can be written as follows:
Isotopes of Hydrogen Atoms
To understand isotopes, it's easiest to learn the simplest system. Hydrogen, the most basic nucleus, has received a great deal of attention. Several of the results seen in more complex nuclei can be seen in hydrogen isotopes. An isotope is a nucleus of the same atomic number (Z) but a different atomic mass number (A). The number of neutrons present in the nucleus varies with respect to the isotope.
Mass of Hydrogen Atom
Hydrogen is one of the most fundamental elements on Earth which is colorless, odorless, and a flammable chemical substance. The representation of hydrogen in the periodic table is H. It is mostly found as a diatomic molecule as water H2O on earth. It is also known to be the lightest element and takes its place on Earth up to 0.14 %. There are three isotopes of hydrogen- protium, deuterium, and tritium. There is a huge abundance of Hydrogen molecules on the earth's surface. The hydrogen isotope tritium has its half-life equal to 12.32 years, through beta decay. In physics, the study of Hydrogen is fundamental.
Only need answers, don't need work shown.
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1. An electron and a proton are accelerated through the same voltage. The electron’s mass is 0.054386734% of the proton’s. The absolute value of the proton’s and electron’s charge is the same. Their final energies will be given by the product of their charge and the accelerating field determined by the voltage. Which has the longer wavelength?
A) electron
B) proton
C) both the same
D) neither has a wavelength
E) only the electron behaves like a wave
2. An electron, neutron and a proton have the same momentum. Which has the longest wavelength?
A) proton
B) electron
C) neutron
D) all have the same
E) none has a wavelength
F) the proton and neutron
G) only the electron behaves like a wave
3. A car is standing in the middle of the flat horizontal road, broken. The car will remain there at rest because:
A) it has too much inertia for the net force to move it
B) there are no forces acting on it
C) it is in a stable equilibrium
D) there is no net force on the car
E) it does move, but too slowly to be seen
F) it is not at rest, it actually moves really fast, we just move with it so it appears to be at rest
4. There are 2 protons and 2 neutrons in an alpha particle, Why doesn’t the alpha particle burst apart?
A) The Coulomb force attracts the protons to the neutrons and holds the alpha particle together.
B) The Coulomb force attracts the neutrons to each other and holds the alpha particle together.
C) Another force besides the Coulomb force exists inside the alpha particle and holds it together.
D) The Coulomb force attracts the protons to each other and holds the alpha particle together.
E) Gravity overpowers the Coulomb repulsive force inside the alpha particle
F) All of the above are true.
G) It is actually unstable, half of the free alpha particles shall actually decay in 15 minutes
5. The microvawes in the microwave oven are designed to have the right amount of energy to
A) focus the image on the folds of your brain or other internal organs
B) slightly heat up parts of your body with a lot of hydrogen
C) excite water molecules to heat water containing substances to higher temperatures
D) create very large magnetic fields to get a high-resolution image
E) cause
F) image nuclei with even number of protons and neutrons
6. An electron is accelerated through a voltage until it has 10 times its initial speed. By what factor has its kinetic energy changed?
A) 1/100
B) 1/10
C) 1 (it stays the same)
D) 10
E) 100
F) It does not have a kinetic energy
G) It only has non-zero momentum
H) None of the above
I) All of the above
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