List of top Physics Questions on Dual nature of radiation and matter asked in GUJCET

Out of the following physical quantities which quantity has the same unit as that of Planck's constant?
The relation between the wavelength of electromagnetic radiation ($\lambda$) and de Broglie wavelength of its quantum (photon) ($\lambda'$) is ______.
The photoelectric cut-off voltage in a certain experiment is 1.5 V. The kinetic energy of photoelectrons emitted will be ______.
In photoelectric effect the graph of stopping potential ($V_0$) versus frequency ($\nu$) is a straight line. The slope of this graph is ______.