Quantum Phenomena

Question 1

What is the wavelength of a wave!

Answer 1

The distance between 2 adjacent points in phase in a wave

Question 2

Equation for Period?

Answer 2

Period = 1/frequency

Question 3

What is wave speed?

Answer 3

Speed of the waves is equal to distance travelled by wave in one cycle divided by time taken for one cycle

Question 4

What is the photoelectric effect?

Answer 4

A type of quantum phenomena that shows light can behave as a particle as well as a wave (the photoelectric effect can only be explained with regards to light acting as particles or “quanta” of energy)

Question 5

Explain the experiment to prove the photoelectric effect

Answer 5

Light is shined on a metal, then electrons could be emitted from the surface of metal.

Question 6

What is the threshold frequency?

Answer 6

Dependant on type of metal used

It’s the frequency required by the incident electromagnetic radiation to emit electrons from the surface of the metal

Question 7

What is the number of electrons emitted per second proportional to?

Answer 7

The intensity of the incident electromagnetic radiation, as long as the frequency of that is above the threshold frequency of the metal

Question 8

How quickly does photoelectric emission occur?

Answer 8

Instantaneously provided the frequency of the incident electromagnetic radiation is above the threshold frequency

Question 9

What is a period of a wave?

Answer 9

The time taken for one whole wave to pass a point through space