95. Let the original tension be τ
1
and the new tension be τ
2
. Then
λ
s2
λ
s1
=
v
s
/f
2
v
s
/f
1
=
f
1
f
2
=
v
2
/λ
1
v
2
/λ
2
=
v
1
v
2
=
τ
1
τ
2
=
1
2
.
Thus, τ
2
/τ
1
= 4. That is, the tension must be increased by a factor of 4.
95. Let the original tension be τ
1
and the new tension be τ
2
. Then
λ
s2
λ
s1
=
v
s
/f
2
v
s
/f
1
=
f
1
f
2
=
v
2
/λ
1
v
2
/λ
2
=
v
1
v
2
=
τ
1
τ
2
=
1
2
.
Thus, τ
2
/τ
1
= 4. That is, the tension must be increased by a factor of 4.