The threshold wavelength of tungsten is `2400 Å` when tungsten is illuminated with light of wavelength `1600 Å`. Find
(i) work function
(ii) maximum KE of emitted electron
(iii) stopping potential
(b) Draw a labelled diagram of an image formed by a compound microscope, with the image at least distance of distinct vision. Write any one expression for its magnifying power.

In an experiment tungsten cathode which has a threshold wavelength 2300 Å is irradiated by ultraviolet light of wavelength 1800 Å . Calculate (a) maximum energy of emitted photoelectronos & (b) work function of the tungsten

Light of 5,500 Å is incident on a metal of work function 2 eV . Calculate the (i) threshold wavelength (ii) maximum velocity of electrons emitted.

Find the magnifying power of a compound microscope whose objective has a focal power of 100D and eye piece has a focal power of 16D when the object is placed at a distance of 1.1cm from the objective. Assume that the final image is formed at the least distance of distinct vision (25cm)

A UV light of wavelength 320 nm is incident on a photosensitive surface and photoelectrons are emitted from it . The stopping potential is 0.48 V. Find (i) the energy of each incident photon. (ii) maximum kinetic energy of a photoelectron. (iii) work function of surface.

The work function for calcium is 2.14 eV. When a light of wavelength 5500Å is incident on it, photoelectrons are emitted , Calculate (i) threshold frequency and threshold wavelength. (ii) maximum velocity of the emitted electrons. (iii) change in maximum kinetic energy of the emitted photoelectrons if the intensity of the incident light is doubled. Take : h = 6.6 xx10^(-34) Js m_e-9xx10^(-31) kg c= 3xx10^8m//s

de Broglie proposed dual nature for electron by putting his famous equation lambda = (h)/(mv). Later on, Heisenberg proposed uncertainty principle as deltapDeltax ge (h)/(4pi). On the contrary, Particle nature of electron was established on the basis of photoelectric effect. When a photon strikes the metal surface it gives up its energy to the electron. Part of this energy (say W) is used by the electrons to escape from the metal and the remaining energy imparts kinetic energy (1//2 mv^(2)) to the ejected photoelectron. The potential applied on the surface to reduce the velocity of photoelectron to zero is known as stopping potential . When a beam of photons of a particular energy was incident on a surface of a particular pure metal having work function =(40 eV), some emitted photoelectrons had stopping potential equal to 22 V. some had 12V and rest had lower values. Calculate the wavelength of incident photons assuming that at least one photoelectron is ejected with maximum possible kinetic energy :