# 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?

## Answers and Replies

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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
Indeed they are! So, follow my suggestion to get your answer.

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