What is photoelectric effect Mcq?
What is photoelectric effect Mcq?
Photoelectric effect: It is the phenomenon of emission of electrons from the surface of metals, when light radiations (Electromagnetic radiations) of suitable frequency fall on them. The emitted electrons are called photoelectrons and the current so produced is called photoelectric current.
What is the formula for photoelectric effect?
By conservation of energy, this reasoning led Einstein to the photoelectric equation Ek = hf − ϕ, where Ek is the maximum kinetic energy of the ejected electron.
What are some examples of photoelectric effect?
Applications of the photoelectric effect brought us “electric eye” door openers, light meters used in photography, solar panels and photostatic copying.
What is the mass of photoelectron?
The mass of a photon electron is 9. 1×10−31 kg.
How do photons have spin?
Electrons and quarks (particles of matter) can have a spin of –1/2 or +1/2; photons (particles of light) can have a spin of –1 or +1; and Higgs bosons must have a spin of 0. Though particle spins are tiny, they have an impact on our everyday world. The spin property of photons allows us to create 3D movies.
Does photocurrent depend on frequency?
Photoelectronic current depends on the intensity of the light and is independent of the frequency of incident light.
Which type of energy uses the photoelectric effect?
Photovoltaic energy
Photovoltaic energy is based on the photoelectric effect—the emission of electrons when electromagnetic radiation (i.e. light) hits a material.
What is Planck’s constant in eV?
Physical constants
| Quantity | Symbol | Value (eV units) |
|---|---|---|
| Planck’s constant | h | 4.1357 × 10-15 eV s |
| reduced Planck’s constant | ℏ = h/2π | 6.5821 × 10-16 eV s |
| Boltzmann’s constant | k | 8.6173 × 10-5 eV K-1 |
| Stefan-Boltzmann constant | σ |
What is the quantum of light called?
photon, also called light quantum, minute energy packet of electromagnetic radiation.
What is the rest mass of photon?
zero
According to electromagnetic theory, the rest mass of photon in free space is zero and also photon has non-zero rest mass, as well as wavelength-dependent.
