This for photoelectric effect physics lab. Why did we have to use filters? How w

Question

This for photoelectric effect physics lab.

Why did we have to use filters? How would we do this experiment if no filters were available?

"Atomic vapour lamps may be used to produce a flux of photons of distinct and characteristic wavelengths. Though the photons from such a source are not monochromatic, they can be separated into single- wavelength beams using an appropriate colour filter. Then, by observing the energy of the electrons that are liberated from the material, as a function of the incident photon wavelength, we can determine:

The mathematical relationship between the photon’s wavelength and its energy (Planck’s constant)

The potential energy in the electric field binding the electrons to the atoms (the work function)."

Explanation / Answer

Filters were used to create light of single wavelength so that relation between wavelength of incident light and energy of photons can be determined clearly. We can create a light of single wavelength by using laser light .

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