Photons

Mr. Anderson explains the photoelectric effect, a phenomenon where light, composed of photons, can eject electrons from metal surfaces. He discusses how Einstein's work in 1905 revealed that light behaves as both a wave and a particle, with energy quantized in discrete units. The video covers the electromagnetic spectrum, spectral lines, and electron transitions. It also includes a demonstration of the photoelectric effect using a PhET simulation, showing the relationship between frequency and energy, and how different metals respond to light. The video concludes with a formula for calculating photon energy.

What phenomenon explains the interaction of UV light with a touch light, as discussed in the video?

• Diffraction

• Photoelectric Effect

• Refraction

• Interference

According to Einstein, what determines the energy of a photon?

• Its speed

• Its wavelength

• Its amplitude

• Its frequency

What evidence supports the idea that light is made of discrete units?

• Continuous spectrum

• Spectral lines

• Reflection

• Refraction

In the PhET simulation, what happens when the wavelength of light is decreased?

• The frequency decreases

• The frequency increases

• The intensity decreases

• The intensity increases

What is the relationship between frequency and energy in the photoelectric effect?

• Exponential relationship

• No relationship

• Inverse relationship

• Direct relationship

What is the formula for calculating the energy of a photon?

• Energy = speed of light x wavelength

• Energy = mass x speed

• Energy = Planck's constant x frequency

• Energy = frequency / wavelength

What did Einstein's findings on the photoelectric effect demonstrate about light?

• Light is only a particle

• Light is neither a wave nor a particle

• Light has both wave and particle properties

• Light is only a wave