Solution

• t=d/v

• pulse 2: t=t1+t2+t3+t4

• v1=c/1.55, v2=c/1.70, v3=c/1.60, v4=c/1.45

• t=(L/c)( 1.55+1.70+1.60+1.45)=6.30(L/c)

• pulse 1: t= t1+t2+t3

• v1=c/1.59, v2=c/1.65, v3=c/1.50

• t=(L/c)(2 x 1.59 + 1.65 +1.50)=6.33(L/c)

• pulse 2 takes least time

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