Speed of a transverse wave on a straight wire (mass 6.0 g

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

Speed of a transverse wave on a straight wire (mass 6.0 g, length 60 cm, and area of cross-section

1.0 \text{ mm}^2

) is

90 \text{ ms}^{-1}

. If the Young's modulus of the wire is

16 \times 10^{11} \text{ Nm}^{-2}

, what is the extension of the wire over its natural length? (1) 0.03 mm (2) 0.02 mm (3) 0.04 mm (4) 0.01 mm