The Photoelectric Effect and Black Body Radiation

Question

Answer

The presence or absence of what was hotly debated in the 19th century to describe the propogation of light through space?

Who said ^'s presence was irrelevant because it couldn't be detected and didn't effect the passage of light?

Maxwell concluded a mutual induction of what fields created self-propogating light waves?

Maxwell's theory gave a defining connection between:

What did Maxwell estimate as the speed of light (in m/s)?

Maxwell's two main predictions were:

What did Hertz use to produce sparks between spherical electrodes of a transmitter?

In Hertz's experiment the spark in the receiver was induced by what newly found EM wave?

Hertz also found that Radio waves had two other properties similar to light when he introduced a mirror. These properties were:

What other characteristic of light did radio waves have?

Hertz used what technique from Lloyd's mirror to calculate his own value for the speed of light

The unit of measurement, hertz (Hz), was named after Heidrich Hertz and is the unit of measurement for:

What is the name of an object that absorbs all incoming radiation?

The peak in intensity of emitted energy from a black body rises and happens at lower wavelengths when what is increased?

According to classical physics, as energy in black bodies decreased, the intensity of the radiation emitted would approach what?

^ violated the law of conservation of energy. What did physicists call this?

To solve this, Planck proposed that energy could be exchanged between the radiation field and the particles in the black body. For this to work though, light must actually be what?

The amount of energy found in one 'packet' of quantised light was calculated witht the equation:

What does h represent in this equation

Energy packets can be absorbed by atoms and then re-radiated. The idea of packets of quantised energy in light waves led to a new form of physics. What is this now known as?

What is now the more common name for a 'packet' of energy rather than quantum?

What does the photoelectric effect remove from a metal surface?

Who discovered the photoelectric effect accidentally?

What is the name for electrons emitted from a metal surface when a light source is shone on it?

Philipp von Lenard, among other things, discovered a well-defined minimum voltage stopped the electrons from being emitted. What was this value called?

Radiation at a lower frequency then at a specific point will result in no emmision of photoelectrons. What is this frequency called?

If the frequency is below that point, no photoelectrons will be emitted even if what is very high?

What does increasing the intensity of the light do?

What does the energy of the photoelectrons depend on?

By explaining that quanta effectively collide with electrons when transferring energy, who helped Planck's theories be accepted?

What is the minimum energy required for the photoelectric effect to happen also known as?

As frequency in light waves increases, what increases for the electrons?

In a graph plotting maximum kinetic energy against frequency in this experiment. What does the gradient represent?

What equation calculates the maximum kinetic energy of a photoelectron?

The photon has the nature that is sometimes like a wave and sometimes like a particle. What is this known as?

Name the device that converts energy from sunlight into electrical energy?

What do solar cells use to harvest energy using the photoelectric effect?

What device is used in light gates and street lights that uses the photoelectric effect?