When a surface is irradiated with light of wavelength `4950 overset(@)(A)`,a photocurrent appears which vanishes if a retarding potential greater than 0.6 V is applied across the phototube.When different source of light is used,it is found that the critical retarding potential is changed to 1.1 V.Find the work function of the emitting surface and the wavelength of the second source

Photocurrent recorded in the micro ammeter in an experimental set-up of photoelectric effect vanishes when the retarding potential is more than 0.8 V if the wavelength of incident radiation is 4950overset@ A . If the source of incident radiation is changed, the stopping potential turns out to be 1.2 V. Find the work function of the cathode material and the wavelength of the second source.

Photocurrent recorded in the micro ammeter in an experimental set-up of photoelectric effect vanishes when the retarding potential is more than 0.8 V if the wavelength of incident radiation is 4950 overset (@)(A) . If the source of incident radiation is changed, the stopping potential turns out to be 1.2 V. Find the work function of the cathode material and the wavelength of the second source .

A metal surface of work function 1.07 eV is irradiated with light of wavelength 332 nm . The retarding potential required to stop the escape of photo - electrons is

When light of wavelength 4000overset@ A falls on photosensitive metal, a negative potential of 2 volt is needed to stop the electron emitted. The work function of metal will be nearly

In biprism experiment the distance between 4th and 13th bright fringes on same side is measured when light of wavelength 6000 overset (@)(A) is used.On replacing the source of light by another of different wavelength without disturbing the adjustment of the apparatus, it is found that the distance between the 5th and 15th bright fringe on same side is the same as distance measured before. What is the wavelength of light used?

A potential difference of 100 v is applied across a wire for 6 minutes and 58 seconds . If the current through the wire is 0.1 A . Find the heat produced in calorie.

A beam of light of wavelength 6400 overset (@)(A) is incident normally on a parallel glass plate of 5cm thick and R.I 1.6 . The beam takes the same to travel from source to incident surface and through the glass plate . The distance of source from incident surface is