What is the relation between threshold frequency and threshold wavelength?

Threshold frequency is the minimum frequency of the light required to remove an electron out of a metal. Since wavelength of light is inversely proportional to its frequency, the threshold wavelength is the maximum wavelength of the light for which the metal will emit electrons.

Which type of light will be detected by a photodiode?

Photodiodes are similar to regular semiconductor diodes except that they may be either exposed (to detect vacuum UV or X-rays) or packaged with a window or optical fiber connection to allow light to reach the sensitive part of the device.

What is threshold frequency for photoelectric effect?

The threshold frequency is defined as the minimum frequency of incident radiation below which the photoelectric emission is not possible completely.

What is the relationship between threshold wavelength and work function?

If the incoming radiation has an energy equal to the work function of the metal then the frequency of the radiation is known as threshold frequency. The relationship between frequency and wavelength is given as $psilon = \dfrac{c}{\lambda }$ , where c is the speed of light and $\lambda $ is the wavelength.

On what factors does the threshold frequency depend?

Threshold frequency is the minimum frequency of incident light which can cause emission of photo-electrons from the metal surface. Photo-emission of electrons is not possible below threshold frequency. Threshold frequency of particular surface depends on nature of its material.

What happens to the wavelength of photon after it collides with an electron?

When a photon collides with an electron then the effect of it is called Compton scattering where the photons interact with the electron, losing momentum and therefore increase in wavelength.

How does photodiode work as photovoltaic cell?

The photodiode is converting light energy from photons into electrical energy by forcing a positive current through the circuit in the clockwise direction (opposite to the label for I_P).

What is the effect of light in a photodiode?

The response time of a photodiode is defined as the time it takes for light generated carriers within the body of the diode to arrive at and cross the P-N junction. When the diode is illuminated, photons of light penetrate into the silicon and are absorbed generating electron-hole pairs.

Does threshold frequency depend on the metal?

Threshold frequency is the minimum frequency of incident light which can cause emission of photo-electrons from the metal surface. Threshold frequency of particular surface depends on nature of its material.

How is the threshold frequency related to the work function?

The energy and frequency of a photon are related by: The minimum energy required to produce photo-emission of electrons is called the work function this depends on the type of metal used. The minimum frequency of light required to give the work function energy is called the threshold frequency.

What is the advantage of using a smaller photodiode?

If you are trying to measure a diffused light source, then a larger area device will capture more light. More light equals more signal. The other option is to focus the light source on a small area if possible — then a smaller photodiode could be used.

Why don’t photons of different wavelengths of light have different wavelengths?

Photons of smaller wavelengths have energy larger than photons of threshold wavelength so there is sufficient energy available with absorbed photon forr electron to be removed from the material. The photons with larger wavelengths, however, cannot release electrons because they do not have sufficient energy. Having said this, there is a caveat.

Why should the incident light on the photodiode be centered?

Inhomogeneity on the edge of an active area of the detector can generate unwanted capacitance and resistance that distorts the time-domain response of a photodiode. Thorlabs therefore recommends that the incident light on the photodiode is well centered on the active area.

What is the threshold wavelength of a photoelectric effect?

Yes that will happen. Cause the condition is incident beam energy should be higher than the threshold energy. Lower wavelength means higher energy. Now as you can observe, lower the wavelength, higher the energy, so threshold wavelength is the wavelength below which the photo electric effect can be observed.