Electroscope and Light Interactions

The video explores the nature of light as particles through the photoelectric effect. Using an electroscope, the presenter demonstrates how light can discharge electrons from a charged plate. Visible light, despite its intensity, fails to dislodge electrons due to insufficient energy per photon. However, ultraviolet light, particularly UVC, successfully knocks electrons off the plate, illustrating the photoelectric effect. This phenomenon, which earned Einstein a Nobel Prize, highlights the wave-particle duality of light. The video also includes a neon bulb experiment and concludes with a discussion on quantum fields.

What is the purpose of an electroscope in the demonstration?

• To measure the frequency of light

• To create light particles

• To measure the amount of electric charge on a plate

• To generate electric charge

How can the electroscope be discharged using light?

• By using a balloon

• By touching the plate

• By hitting it with particles of light

• By insulating it from the environment

Why doesn't visible light discharge the electroscope?

• It is too dim

• It is too bright

• It doesn't have enough energy per photon

• It has too many photons

Which type of light successfully discharges the electroscope?

• Shortwave ultraviolet light

• Red light

• Green light

• Blue light

What happens when shortwave ultraviolet light is shone on the electroscope?

• The plate becomes positively charged

• The needle moves immediately

• Nothing happens

• The plate gains more electrons

What is the photoelectric effect?

• The absorption of light by a material

• The refraction of light through a medium

• The reflection of light from a surface

• The emission of electrons when light hits a material

What did Einstein win the Nobel Prize for?

• Theory of Relativity

• Quantum Mechanics

• Photoelectric Effect

• Wave-Particle Duality

How does the frequency of light affect its ability to knock electrons loose?

• Higher frequency light has more energy per photon

• Frequency does not affect the energy per photon

• Both high and low frequency light have the same energy per photon

• Lower frequency light has more energy per photon

What is the smallest possible vibration of a quantum field called?

• Wave

• Photon

• Particle

• Frequency

Why can't we detect a particle of radio waves?

• They are too dim

• They have too high energy

• They have too low energy

• They are too bright