In a compton effect experiment, the change in a photon's wavelength is a function of the density of the scattering target.
the initial wavelength of the photon.
the atomic number of the scattering target.
the scattering angle.
the final wavelength of the photon.

The correct answer is the scattering angle.

Explanation:

Compton effect is defined as the effect which leads to the increase in wavelength of monochromatic, electromagnetic radiation such as X-rays or gamma rays when the particles are scattered.

The equation for Compton effect, which is change in wavelength is given as:

where,

= change in wavelength of radiation

h = Planck's constant =

= mass of electron =

c = speed of light =

= cosine function of scattering angle

As, seen from above the change in photon's wavelength depends scattering angle. All the other variables are constant.

Hence, the correct answer is the scattering angle.