Calculation wavelength of an acoustic sound wave in air. Given frequency and temperature and no air pressure - sengpielaudioChecker
 
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Calculation of the wavelength of an acoustic wave
in air when frequency and temperature is known

Enter the given values in the upper gray fields and click 'calculate'.
The calculated answers will be shown in the lower boxes. 20°C = 68°F

Frequency   Hz   Temperature   °C
       
                        
       
 Wavelength   cm    Speed of sound   m/s  
 Cycle duration   ms  

The wavelength is changing with the changing of the temperature, because the
speed of sound changes with the temperature. The air pressure is irrelevant!

Calculation of the wavelength of radio waves and acoustic waves
Calculation of the speed of sound in humid air (with air pressure)
Calculation speed of sound in air and the temperature

The formulae (formulas):  c = λ × f     λ = c / f = c × λ     f = c / λ

Physical value Symbol Unit Formula
Frequency f = 1/T Hz = 1/s  f = c / λ 
Wavelength λ m  λ = c / f 
Time period or
cycle duration
T = 1/f  s  T = λ / c 
Wave speed c m/s c = λ × f

Notice: Speed of sound in air c = 343 m/s at 20 °C (68 °F) or
speed of radio waves and light in a vacuum c = 299,792,458 m/s ≈ 300 000 km/s.
The velocity of propagation of electric signals via copper cables is nearly
9/10 of the speed of light, which means ≈ 270,000 km/s.
The velocity of propagation of electric signals via optical fibres is nearly
2/3 of the speed of light, which means ≈ 200,000 km/s.

It may be worth looking how different variables act on the wave.
Take the wave equation (formula) y(t) = A * (sin ω t + φ) + C
The A is the amplitude and represents the difference between the upper and lower peaks.
The ω is the angular velocity: ω = 2 π f = 2 π / T
The φ is the phase angle, the horizontal offset.
The C is the vertical offset from the x-axis, usually defined as the DC offset of the waveform.

Difference between speed and velocity

Speed is a distance an object goes. Velocity is a measurement of speed and direction.
Speed is a scalar quantity - it only has magnitude. Velocity is a vector quantity - it has both
magnitude and direction.
Speed is the first derivative of distance with respect to time.
Velocity is the first derivative of displacement with respect to time.
Speed and velocity are related in much the same way that distance and displacement
are related. Speed is a scalar and velocity is a vector.

Speed of sound in different medias

Media Speed of sound m/s
PVC soft     80
Air               343 at 20°C
Cork   500
Helium 1020
Water 1480
Polystyrol 1800
Plexiglas 1840
Concrete 3100
Tile 3600
Pine wood 3600
Granite 3950
Oak wood 4100
Iron 5000
Steel 5050
Aluminium 5200
Quartz glas 5400

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