Answer the following questions and discuss your answers with your classmates.
- Which color light is the result of greater energy transition, red or blue? When an electron makes a transition from its first quantum level to the ground level, the energy difference is carried by the emitted photon. In comparison, how much energy is needed to return an electron at ground level to the first quantum level? How can it be provided? Explain.
- What evidence supports the notion that light has wave properties? What evidence supports the view that it has particle properties?
- Describe the changes in atomic number when a nucleus emits one alpha particle, one beta particle, or one gamma ray.
- What prevents protons in the nucleus from flying apart due to electrical repulsion? Do protons in a very large nucleus have a greater chance of flying apart? Are they less stable than smaller nuclei? Explain.
- What is the atomic number and mass number of the new element produced when 84218Po emits a beta particle?
- A sample of a particular isotope registers 160 counts per minute. Eight hours later, the detector registers a rate of 10 counts per minute. What is the half-life of the material? How is this calculation related to carbon-14 dating?
Unit 5 Assignment
For this assignment, please answer the following questions:
- Define the concept of half-life.
- Why are the electrons in a helium atom closer the nucleus compared to the electron in a hydrogen atom?
- State the number of protons and neutrons in each of the following three elements:
- Describe the role of electrical forces in nuclear fission. When a nucleus undergoes fission, what role can the ejected neutrons play?
The electron of the hydrogen atom is initially on the ground state. It absorbs a photon and jumps to a state for which the quantum number n is equal to 4.
- Define ground state.
- If the electron drops back to the ground state, will a photon be emitted? If yes, what would be the energy or wavelength of the emitted photon compared to that of the absorbed photon?
PLEASE WRITE OUT EACH QUESTION AND THEN WRITE OUT THE ANSWER. ANSWER EACH QUESTION SEPARATELY PLEASE!
|Due By (Pacific Time)
||06/11/2013 12:00 am