Given figure shows few data points in a photo electric effect experiment for a certain metal. The minimum energy for ejection of electron from its surface is: (Plancks constant ${}^{}$ )

The work function of a metal is w0 and l is wavelength of incident radiation. There is no emission of photoelectron whenThe work function of a metal is w0 and l is wavelength of incident radiation. There is no emission of photoelectron when\

Photons with energy 5 eV are incident on a cathode C in a photoelectric cell. The maximum energy of emitted photoelectrons is 2 eV When photons of energy 6 eV are incident on C, no photoelectrons will reach the anode A, if the stopping potential of A relative to C is

In a photoelectric experiment, increasing the intensity of incident light:

The work functions of Caesium (Cs), Potassium (K) and Sodium (Na) are $2.14\mathrm{e}\mathrm{V},2.30\mathrm{e}\mathrm{V}$ and $2.75\mathrm{e}\mathrm{V}$ respectively. If incident electromagnetic radiation has an incident energy of $2.20\mathrm{e}\mathrm{V}$ , which of these photosensitive surfaces may emit photoelectrons?
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When photon of energy $4.0\mathrm{e}\mathrm{V}$ $$ strikes the surface of a metal $A$ $$ , the ejected photoelectrons have maximum kinetic energy $T_A$ ${}_{}$ eV and de-Broglie wavelength ${\lambda }_A$ ${}_{}$ . The maximum kinetic energy of photoelectrons liberated form another metal B by photon of energy 4.50 $\mathrm{e}\mathrm{V}$ $$ is $T_B=\left(T_A-1.5\right)eV$ ${}_{}\left({}_{}\right)$ . If the de-Broglie wavelength of these photoelectrons ${\lambda }_B=2{\lambda }_A$ ${}_{}{}_{}$ , then the work function of metal $$ $B$ is