Question 172: Waves

Question

A tuning fork of frequency 480 Hz is used in an experiment for measuring speed of sound (v) in air
by resonance tube method. Resonance is observed to occur at two successive lengths of the air column,
l1 = 30 cm and l2 = 70 cm. Then, v is equal to -

Accepted Answer

We know,
$$\lambda $$ = 2($${l_2} - {l_1}$$)
given $${l_2}$$ = 70 cm and $${l_1}$$ = 30 cm
$$ 	herefore $$ $$\lambda $$ = 2(70 - 30) = 80 cm
Also we know, v = $$\lambda $$$$f$$ = 0.8 $$ 	imes $$ 480 = 384 m/s

Answer

338 ms–1

Answer

384 ms–1

Answer

379 ms–1

Answer

332 ms–1

Waves

A tuning fork of frequency 480 Hz is used in an experiment for measuring speed of sound (v) in air by resonance tube method. Resonance is observed to occur at two successive lengths of the air column, l1 = 30 cm and l2 = 70 cm. Then, v is equal to -

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