Quantum Physics Experiments Quiz

What is the purpose of the variable resistor in the LED experiment?

• To increase the current through the LED

• To measure the wavelength of the LED

• To connect the LED to the power supply

• To vary the potential difference across the LED

Why is it important to connect the LED correctly in the circuit?

• To increase the brightness of the LED

• To allow current to flow through the LED

• To prevent the LED from overheating

• To ensure the LED changes color

What does the photoelectric effect demonstrate about light?

• Light behaves only as a wave

• Light behaves only as a particle

• Light has both wave and particle properties

• Light does not interact with metal surfaces

What determines whether electrons are emitted in the photoelectric effect?

• The color of the light

• The intensity of the light

• The angle of incidence of the light

• The frequency of the light

In the photoelectric effect equation, what does the gradient of the graph represent?

• The maximum kinetic energy

• The work function

• The threshold frequency

• Planck's constant

What happens to the gold leaf in the electroscope experiment when UV light is applied?

• The gold leaf remains unchanged

• The gold leaf drops

• The gold leaf changes color

• The gold leaf rises

Why does the gold leaf not drop when visible light is used in the electroscope experiment?

• Visible light increases the intensity of the charge

• Visible light has higher energy than UV light

• Visible light has lower energy than the work function

• Visible light is absorbed by the glass

What is the de Broglie wavelength of a particle dependent on?

• The particle's speed

• The particle's charge

• The particle's mass

• The particle's momentum

In the electron diffraction experiment, what is the role of the graphite sheet?

• To accelerate the electrons

• To absorb the electrons

• To provide a surface for electron reflection

• To create a diffraction pattern

What is demonstrated by the concentric rings in the electron diffraction experiment?

• The speed of electrons

• The wave nature of electrons

• The particle nature of electrons

• The charge of electrons