Question 128: Waves

Question

A wire of length L and mass per unit length
6.0 × 10
–3
kgm
–1
is put under tension of
540 N. Two consecutive frequencies that it
resonates at are : 420 Hz and 490 Hz. Then L
in meters is :

Accepted Answer

Fundamental frequency = 70 Hz.
70 = $${1 \over {2l}}\sqrt {{T \over \mu }} $$
$$ \Rightarrow $$ $$l$$ = 2.14 m

Answer

5.1 m

Answer

2.1 m

Answer

1.1 m

Answer

8.1 m

Waves

A wire of length L and mass per unit length 6.0 × 10 –3 kgm –1 is put under tension of 540 N. Two consecutive frequencies that it resonates at are : 420 Hz and 490 Hz. Then L in meters is :

Choose the correct answer: