I need help on these 3 questions.
1. The probability that an electron will return to a lower energy level by emitting a photon is called:
a. spontaneous emission
b. line emission
c. the Bohr radius
d. the ground state
I'm thinking that this one is D.
2. The wave-particle duality of light means that the in a single experiment
a. light will act both like a wave and like a particle
b. light will act either like a wave or like a particle
c. light will not act like a wave nor like a particle
d. light always exists as two waves or as two particles
I think this one is A.
3. In order to find the momentum of an electron more precisely, you need to:
a. use lower-energy photon
b. use a higher-energy photon
c. use a high-frequency photon
d. use a short-wavelength photon
I am guessing B.
The first question is very poorly worded. Try this as the question: The event in which an electron will return to a lower energy level....is called:
As it is now worded, the question has answer.
You are right on number two.
In finding momentum, the uncertainity principle infers that there will be an interaction with the measuring particle. A high energy photon would have a lot of energy to interact with the electron being measured. It would be a poor choice.
Your answers for the first and second questions are correct. However, for the third question, your guess of using a higher-energy photon (answer B) is incorrect.
To find the momentum of an electron more precisely, you actually need to use a lower-energy photon (answer A), not a higher-energy photon. This is because using a lower-energy photon reduces the amount of interaction and disturbance to the electron, thus allowing for a more precise measurement of its momentum.
So, the correct answers are:
1. - d. the ground state
2. - a. light will act both like a wave and like a particle
3. - a. use a lower-energy photon