Energy levels
A mercury atom returns to the ground state from an excited state. State one possible energy change
4.64 eV
Convert 7.0 x 10^-19 J to eV
4.375 eV
What color light in the visible spectrum has the least energy per photon
What is red?
Explain the wave particle duality
Light travels like a particle and interacts like a wave.
After a mercury atom is excited to the n=d state how many different frequencies of radiation can be emitted as the electrons return to the ground state.
8
Convert 4.64 eV to joules
7.424 x 10^-19 J
What type of photon is emitted when an electron in hydrogen drops from the n=2 to the n=1 energy level?
ultraviolet?
When is the Regents Exam in Physics this year
June 24th at 11:15 am (It may be 11am listen for announcements)
What is the anti-particle of an electron called and give it's mass and charge.
what is a positron, mass 9.11 x 10^-31 Kg, charge is +1
quarks, three of each What is the larger classification of particles called?
The frequency of a photon whose energy is 2X10^-19 J Don't forget the correct units....
3 x 10^14 Hz
The ratio of energy of a quantum of electromagnetic radiation to the frequency is
What is Planck's constant?
According to the standard model of physics a meson is composed of
a quark and an anti-quark
What is conserved in a photon-particle collision (give at least two)
mass,energy, momentum?
A photon having an energy of 4.2 eV strikes mercury in the ground state. Is it absorbed? Why or why not
It is not absorbed because it does not have the minimum amount of energy.
What happens when a particle and it's anti-particle collide?
They annihilate each other and the mass is converted to energy.
According to the standard model of physics a baryon is composed of
three quarks
What would the charge on this baryon be
uud (show your work)
A photon having a wavelength of 2.29 x 10^-7 m strikes a mercury atom in the ground state. Calculate the energy in Joules.
8.69 x 10^-19 J
What type of matter is not affected by the strong force
Leptons, example is an electron