Potassium and gold cathodes are used in a photoelectric-effect experiment. For each cathode, find: The threshold frequency. The threshold wavelength. The maximum electron ejection speed if the light has a wavelength of 170 nm
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.
Potassium and gold cathodes are used in a photoelectric-effect experiment. For each cathode, find:
- The threshold frequency.
- The threshold wavelength.
- The maximum electron ejection
speed if the light has a wavelength of 170 nm
- .
- The stopping potential if the wavelength is 170 nm
- .
Throughout this problem, be sure to use 6.63×10−34J⋅s
for Planck's constant.
a) The maximum photoelectron ejection speed in meters per second for an electron ejected from potassium if the light has a wavelength of 170 nm. Express your answer in meters per second.
b)The maximum photoelectron ejection speed in meters per second for an electron ejected from gold if the light has a wavelength of 170 nm .
c)The stopping potential in volts for potassium if the wavelength is 170 nm.
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