Question

Compton shift in wavelength is zero scattering angle of photon is:

a= 90

b=180

c=0

d=45

Answer 1

We know that

$\lambda'-\lambda=\frac{h}{m_0c}(1-cos\phi)$

∆$\lambda=\frac{h}{m_0c}(1-cos\phi)$$\rightarrow(1)$

Given

$∆\lambda=0$

equation (1) put value

$0=\frac{h}{m_0c}(1-cos\phi)$

$1-cos\phi=0$

$cos\phi=1$

$\phi=cos^{-1}(-1)=180°$

Option (b) is correct