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a. A stopping potential of 0.82V is requ...

a. A stopping potential of `0.82V` is required to stop the emission of photoelectrons from the surface of a metal by light of eavelength `4000 A`. For light of wavelength `3000 A`, the stopping potential is `1.85V`. Find the value of Planck's constant. [1 electrons volt (eV)`=1.6xx10^(-19)J]`
b. At stopping potential, if the wavelength of the incident light is kept fixed at `4000 A`, but the intensity of light increases two times, will photoelectric current be botained ? Give reasons for your answer.

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To solve the problem step by step, we will break it down into parts (a) and (b) as given in the question. ### Part (a): Finding the value of Planck's constant 1. **Understanding the Photoelectric Effect**: The maximum kinetic energy (K.E.) of the emitted photoelectrons can be expressed using the equation: \[ K.E. = E - \Phi ...
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