Answer:
hence initial wavelength is 
Explanation:
shift in wavelength due to compton effect is given by

λ' = the wavelength after scattering
λ= initial wave length
h= planks constant
m_{e}= electron rest mass
c= speed of light
θ= scattering angle = 180°
compton wavelength is


( put cos 180°=-1)
also given λ'=2λ
putting values and solving we get

hence initial wavelength is 
It’s 45 the plane flying from the north
Answer:
Its <u>Y,W,Z,X </u>
<u>I just took the test</u>
Explanation: