In an experiment on photoelectric effect, the slope of the cut off voltage versus frequency of incident light is found to be `4.12xx10^(-15)Vs`. Given `e=1.6xx10^(-19)C`, estimate the value of Planck's constant.

In an experiment on the photoelectric effect , the slope of the cut - off voltage versus frequency of incident light is found to be 4.12xx10^(-15) V s . The value of Planck's constant is

Photons of frequencies 2.2xx10^(15) Hz and 4.6xx10^(15) Hz are incident on a metal surface. The corresponding stopping potentials were found to be 6.6V and 16.5V respectively. Given e=1.6xx10^(-19) c , the value of universal planck's constant is

Calculate the speed of the electron in the first Bohr orbit given that h=6.6xx10^(-34) Js, m=9.11xx10^(-31) kg and e=1.603xx10^(-19) C .

For photoelectric effect in sodium, fig. shows the plot of cut-off voltage versus frequency of the incident radiation. Caclculate: (i) the threshold frequency (ii) the work function for sodium. (Use h=6.6xx10^(-34)Js )

In a photoelectric experiment it was found that the stopping potential decreases from 1.85 V to 0.82 V as the wavelength of the incident light is varied from 300 nm to 400 nm. Calculate the value of the Planck constant from these data.

Electrons ejected from the surface of a metal, when light of certain frequency is incident on it, are stopped fully by a retarding potential of 3 volts. Photo electric effect in this metallic surface begains at a frequency 6xx10^(14)s^(-1) . The frequency of the incident light in s^(-1) is [h=6 x10^(-34) J-sec , charge on the electron = 1.6xx10^(-19)C ]

By how which would the stopping potential for a given photosensitive surface go up if the frequency of the incident radiations were to be increased from 4xx10^(15)Hz to 8xx10^(15)Hz ? Given, h=6.6xx10^(-34)Js , e=1.6xx10^(-19)C and c=3xx10^8ms^-1 .