# Compton effect?

for the following question:
for electromagnetic waves A of wavelength 10pm and electromagnetic waves B o f wavelengthh 20 pm, which produces more pronounced Compton effect?

my problem:
the question doesn't give the scattering angle or final wavelength, so isn't this question too ambiguous?

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Tide
Homework Helper
The final wavelength depends on the scattering angle so why not compare how they each scatter from a given particle starting at rest?

can you explain what do you mean by that?

Tide
Homework Helper
The change in wavelength in Compton scattering is:

$$\Delta \lambda = \frac {h}{m_e c} \left( 1 - \cos \theta \right)$$

where $\theta$ is the scattering angle. You can use that to compare the change in energy of the photons to determine which produces a "more pronounced Compton effect."

but delta lamda and cos(cita) are both variables!!!

Tide
Homework Helper

maybe my english isn't too good~
i still don't understand what you mean...
@@a

Astronuc
Staff Emeritus
How about - the greater the photon energy, i.e. shorter the wavelength, the more momentum the photon has - p = E/c.

Think of conservation of momenutm and energy.

@@a
i thought you also had to consider what type of material it hits, because doesn't compton effect has a range?

Tide
Homework Helper
Your original question was which photon produces a more pronounced Compton effect? Logically, you will keep all other variables the same and only consider what effect the wavelength has on the scattering.

i see... so that would be B wavelength produces the more pronouced Compton effect right?

Tide