# physics

posted by .

The third resonant length of a closed air column is 75cm . What is the first and second length

• physics -

L= 5•λ/4,
λ =4•L/5 = 4•75/5= 60,
L1 = λ/4 =60/4=15 cm,
L2=3•λ/4=45 cm.

## Similar Questions

1. ### Physics

The first and second resonant lengths of an air column that is closed at one end are 15.5 cm and 45.5 cm, respectively. What is the best value for the wavelength?
2. ### physics

A) As a wind instrument warms up, the resonant frequencies of the instrument tend to slightly decrease. B) If the air in a concert hall warms up, the resonant frequencies of the string instruments will change precisely the same as …
3. ### PHYSICS

A) As a wind instrument warms up, the resonant frequencies of the instrument tend to slightly decrease. B) If the air in a concert hall warms up, the resonant frequencies of the string instruments will change precisely the same as …
4. ### Physics

A 520 Hz tuning fork produces a standing wave in a column of air in a closed tube. If the speed of sound is 340 m/s, what is the length of the air column?
5. ### physics

The first resonant length of a closed air column occurs when the length is 30.0cm . What will the second and third resonant lengths be
6. ### physics

The second resonant length of an open air column is 48cm. Determine the first and third resonant lengths
7. ### Physics

A variable-length air column is placed just below a vibrating wire that is fixed at the both ends. The length of air column open at one end is gradually increased from zero until the first position of resonance is observed at 20 cm. …
8. ### Physics

A variable-length air column is placed just below a vibrating wire that is fixed at the both ends. The length of air column open at one end is gradually increased from zero until the first position of resonance is observed at 20 cm. …