This task will take you through the topic on electrons and photons. It forms part of your course work as outlined in the IEB SAGS document.
Watch the videos and answer the questions that follow.
This is a timed assignment and must be completed in one sitting.
![]()
This task will take you through the topic on electrons and photons. It forms part of your course work as outlined in the IEB SAGS document.
Watch the videos and answer the questions that follow.
This is a timed assignment and must be completed in one sitting.
![]()
Watch the following video on the basic concepts involved in the photoelectric effect.
Answer the questions according to the time stamps on the video.
You may begin viewing at time: 10:44 (first marker on the video time line)
Complete Activity 9.1 in your workbook page 274 and upload your answers
The greater the frequency of the EMR, the smaller its wave.
What metal is placed on the electroscope?
The plate has to be negatively charged.
Match the correct observations. Drag the observation to the correct light source.
| Stavka koja se može prevući | arrow_right_alt | Odgovarajuća stavka |
|---|---|---|
gold leave remains in upright position | arrow_right_alt | UV Light |
gold leave drops | arrow_right_alt | visible light from the desk lamp |
The brightness of the visible light will cause the gold leave to drop.
One photon of light releases
Define work function of a metal.
What metal is placed on the electrode?
What was the wavelength of the incident waves when the first observed electrons moved away from the cathode? Write down the value(number) only using ? (unit is nm)
Use the formula
to determine the frequency in Hz of this incident radiation. write down the value only.
If the frequency of incident radiation is
Hz, calculate the energy carried by one photon of this light ?
Explain what is meant by the photoelectric effect.
How does an increasing the intensity of light affect the current in the circuit. Assume the light has a frequency greater than the threshold frequency. (increase, decrease, remains unchanged)
Are electrons ejected from a metal when the the incident radiation is below the threshold frequency? (yes/No)
Which metal is placed on the cathode now?
Why does this metal require a greater frequency of incident radiation to cause electrons to be ejected ?
What maximum wavelength is required to eject electrons from this metal
What does an increase in intensity of incident radiation produce before it strikes the metal?
Light is made up of
What field of physics did this discovery by Albert Einstein open up?