Question 484: Waves

Question

An air column, closed at one end open at the other, resonates with a tuning fork when the smallest length of the column is 50 cm. The next larger length of the column resonating with the same tuning fork is

Accepted Answer

From figure,
First harmonic is obtained at
$$l = {\lambda  \over 4} = 50\,cm$$
Third harmonic is obtained for resonance,
$$l' = {{3\lambda } \over 4} = 3 	imes 50 = 150\,cm$$

Answer

150 cm

Answer

200 cm

Answer

66.7 cm

Answer

100 cm

Waves

An air column, closed at one end open at the other, resonates with a tuning fork when the smallest length of the column is 50 cm. The next larger length of the column resonating with the same tuning fork is

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