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1`1.1``1.2`2

Answer :

BSolution :

`lamda'=(vw.r.t.observer)/(f')` <br> `=(v+v_2)/(f_0((v+v_2))/((v-50)))=(v-50)/(f_0)` <br>`lamda''=(v+50)/(f_0((v+v_2)(v+50))/((v-v_2)(v-50)))=((v-v_2)(v-50))/(f_0(v+v_2))` <br> `(lamda')/(lamda'')=(v+v_2)/(v-v_2)=(1050+50)/(1050-50)=1.1`