What is threshold wavelength?
What is threshold wavelength?
Solution : Threshold wavelength is the maximum wavelength of the incident radiation above which no photo emission takes place.
How do you find the threshold wavelength?
The frequency of the light for which its energy is equal to the work function is called threshold frequency ν0. Therefore, ϕ=hν0. Let us use the relation between the frequency and the wavelength of light, i.e. ν=cλ. When the light wave has threshold frequency, its wavelength is called threshold wavelength (λ0).
What is the threshold wavelength for sodium?
Threshold wavelength for photoelectric effect on sodium is 5000 Å.
What is the formula of threshold frequency?
f = W/h where h is planck’s constant. Therefore if we know the work fucntion we can work out the threshold frequency but don’t forget to convert 3eV into J. 1eV = 1.6 x 10^{-19} J.
Why is threshold wavelength maximum?
So to get this minimum value of energy, there should be a maximum wavelength photon. The maximum wavelength of incident radiation that is necessary to release electrons from a given surface in the photoelectric effect is called threshold wavelength. Hence the correct answer is option 1.
What is the threshold wavelength of metal?
The threshold wavelength of a metal having work function 2 eV is 6000 Å .
What is the threshold wavelength of copper?
If ultraviolet light of wavelength 1500A is incident on the surface, the maximum velocity of the ejected photoelectrons is 10 m/s.
What is the threshold frequency of zinc?
6·50 × 1014 Hz.
The threshold frequency of radiation for zinc is 6·50 × 1014 Hz. (a) The zinc plate is initially negatively charged. A lamp is used to shine ultraviolet radiation of frequency 6·7 × 1014 Hz onto the zinc plate.
What is threshold frequency of a metal?
The threshold frequency of a metal refers to the frequency of light that will cause an electron to dislodge from that metal. Light below a metal’s threshold frequency will not eject an electron. Light at the threshold frequency will dislodge the electron with no kinetic energy.
What is the threshold frequency for potassium?
3 × 10^14 Hz
The threshold frequency of Potassium is 3 × 10^14 Hz .
What is the threshold wavelength of photon?
The binding energy per mole when threshold wavelength of photon is 240nm is:[Given: hc = 20 × 10^-26, NA = 6 × 10^23]