A. Photoelectric current does not depend on the nature of the emitter material.

• This statement is incorrect. The photoelectric current does depend on the nature of the emitter material. Different materials have different work functions and photoelectric thresholds, which affect how easily electrons can be ejected from the material when exposed to light.

B. Photoelectric effect is an instantaneous process.

• This statement is correct. The photoelectric effect is nearly instantaneous. When photons of sufficient energy strike a material's surface, electrons are emitted almost immediately.

C. The stopping potential is directly related to the maximum kinetic energy of electrons emitted.

• This statement is correct. The stopping potential in a photoelectric experiment is related to the maximum kinetic energy of emitted electrons. By applying a stopping potential, one can control the kinetic energy of the emitted electrons.

D. Energy required for the electron emission from the metal should be less than the work function.

• This statement is incorrect. For electrons to be emitted from a metal in the photoelectric effect, the energy of the incident photons must be greater than or equal to the work function of the metal. The work function is the minimum energy required to remove an electron from the metal surface.

E. The dualism of matter is inherent in the de Broglie relation.

• This statement is correct. The de Broglie relation, which relates the wavelength of a particle to its momentum, is one of the key principles of quantum mechanics and demonstrates the duality of matter, meaning that particles like electrons exhibit both particle and wave-like behaviour.

So, the correct statements are B, C, and E. The correct answer is option 4: "B, D, and E Only."