PHY 205 Quiz

1. In Thompson’s experiment, a a beam of electron travelling at 6.8 x 10^7m/s is bent into a circular path of radius 4cm in the magnetic of induction 10^-2 W/m2. Find the specific charge to mass (e/m)

2. In what devices are cathode ray tubes commonly used?

3. What type of radiation can be produced using cathode ray tubes?

4. What happens when a metal wire is heated in a vacuum during thermionic emission?

5. What is thermionic emission?

6. Why is it necessary for the tube to be in a vacuum during thermionic emission?

7. High beam of cathode ray in vacuum tube can be steered and manipulated by

1. In Rutherford's model, where is the positive charge concentrated?

2. What is a photon?

3. What are electromagnetic waves?

4. In quantum mechanics, what role does a photon play in the electromagnetic field?

5. How are the electrons distributed in Thomson's model?

6. What is the significance of alpha particle scattering experiments in Rutherford's model?

7. What is the primary reason for the scattering of alpha particles in Rutherford's model?

8. If the dimensions of the nucleus are small enough, what can happen to alpha particles passing very near the nucleus in Rutherford's model?

9. In electromagnetic waves, how do the electrical and magnetic components oscillate?

10. In Thomson's model, where are the negatively charged electrons located?

11. How do the oscillations of the electrical and magnetic components in electromagnetic waves relate to the direction of propagation?

12. Arrange the following types of electromagnetic radiation in order of increasing frequency:

13. According to quantum mechanics, what is the alternate view of electromagnetic radiation (EMR)?

14. Arrange the following types of electromagnetic radiation in order of increasing wavelength

1. Which of the following statements about electrons within an atom is true?

2. Electrons, being fermions, adhere to which principle that prohibits two electrons from occupying the same quantum state?

3. Which of the following statements is TRUE?

4. What type of process is represented by this equation e† + e¯ → ϒ + ϒ

5. What is the relative mass of an electron compared to a proton?

6. What is the electric charge of a positron?

7. What term is used to describe the lowest energy state that an electron can occupy within an atom?

8. Which field properties does an electron exhibit due to its charge and motion?

9. What is the intrinsic angular momentum (spin) value of an electron?

10. Wavelength is inversely proportional to an object’s mass

11. Electrons absorbs energy in form of photons as they are accelerated

12. Which of the following is not quantized?

13. Which branch of physics is concerned with the quantization of energy and its effects on the interaction of matter and energy?