Can you find Wavelength without Frequency?

[CNBA3]

Say you want to find the wavelength of a sound-wave, but you don't have a frequency, what would be the best method to find the wavelength height?

 

[CNBA3]

I heard that you can get frequency from 1 divided by time, would the time be refered to how long the sound continued to propagate?

here is the calculator

Period to Frequency Calculator

This tool will convert the period to the equivalent frequency value, by calculating the number of cycles or revolutions per unit period of time from the time it takes to complete one full cycle or revolution, f=1/T, ω=2π/T

www.sensorsone.com

 

[SeijiSetto]

Say you want to find the wavelength of a sound-wave, but you don't have a frequency, what would be the best method to find the wavelength height?

Wavelength and height are two different things. Wavelength is the length of the wave. When you say height, I believe what you're talking about is amplitude. Think about dropping a pebble into a pond. Amplitude is how tall the ripples are, wavelength is the distance from one ripple to the next.

 

[Catpija]

I heard that you can get frequency from 1 divided by time, would the time be refered to how long the sound continued to propagate?

Period is how long does it take for the wave to complete a full cycle/wavelength

 

[CNBA3]

Wavelength and height are two different things. Wavelength is the length of the wave. When you say height, I believe what you're talking about is amplitude. Think about dropping a pebble into a pond. Amplitude is how tall the ripples are, wavelength is the distance from one ripple to the next.

yeah, I kind of figured that out later, thanks, Is there a way to measure the distance of a ripple from a shout? Would a air ripple be calculable?

 

[CNBA3]

Period is how long does it take for the wave to complete a full cycle/wavelength

Okay, so is that from the origin point of a wave to it’s destination?

 

[Nenhetode]

measure the distance of a ripple from a shout

distance = speed of sound * time

the time it takes for the ripple to travel from the source to the observer can be measured by timing the interval between the shout and the arrival of the ripple

Okay, so is that from the origin point of a wave to it’s destination?

no, the period of a wave is the time it takes for one complete cycle of the wave to occur. the wave would have to travel back to its origin point before the period would be complete. what you are referring to is the wavelength

 

[CNBA3]

distance = speed of sound * time

the time it takes for the ripple to travel from the source to the observer can be measured by timing the interval between the shout and the arrival of the ripple


no, the period of a wave is the time it takes for one complete cycle of the wave to occur. the wave would have to travel back to its origin point before the period would be complete. what you are referring to is the wavelength

Okay, I think I understand, so like say the time it takes is 2.5 seconds to reach the target and travels at the speed of sound, right?

Okay, i think i get it, so the period would be double what the distance would be from what would be found on top right?

 

[Nenhetode]

Okay, I think I understand, so like say the time it takes is 2.5 seconds to reach the target and travels at the speed of sound, right?

Okay, i think i get it, so the period would be double what the distance would be from what would be found on top right?

yes

 

[CNBA3]

yes

Okay, thanks.

 

[GarrixianXD]

Frequency is inversely proportional to time so if you have the time then you could calculate the wavelength without an exact frequency

 

[CNBA3]

Frequency is inversely proportional to time so if you have the time then you could calculate the wavelength without an exact frequency

Okay, thanks, I guess the time is around 10.5 seconds long, 2.5 seconds for the sound wave to reach the the destination and 8 seconds for the sound to affectively destroy the target.

 

[GarrixianXD]

Okay, thanks, I guess the time is around 10.5 seconds long, 2.5 seconds for the sound wave to reach the the destination and 8 seconds for the sound to affectively destroy the target.

f = 1/t

t = time which is 10.5s
f = 1/10.5
the frequency would be 0.0952381 s^-1

Since you're calculating soundwaves then the velocity would be 343 m/s

λ = velocity/frequency = 343/0.0952381 = 3601.5m ≈ 3.6km

 

[GarrixianXD]

Here's another formula for wavelength:

λ = h/mv

m = mass
v = velocity
h = Planck's constant (6.626 x 10^-34)

Hope this helps

 

[SeijiSetto]

f = 1/t

t = time which is 10.5s
f = 1/10.5
the frequency would be 0.0952381 s^-1

Since you're calculating soundwaves then the velocity would be 343 m/s

λ = velocity/frequency = 343/0.0952381 = 3601.5m ≈ 3.6km

This isn't really helpful. T actually needs to be the time period of one wave, i.e the time it takes for one wavelength to repeat. NOT just however long the sound was going for.

Here's another formula for wavelength:

λ = h/mv

m = mass
v = velocity
h = Planck's constant (6.626 x 10^-34)

Hope this helps

deBroglie wavelength is typically only used for singular particles like electrons (hence why mass is involved) compared to sound waves which move lots of air molecules in pressure waves.

 

[CNBA3]

This isn't really helpful. T actually needs to be the time period of one wave, i.e the time it takes for one wavelength to repeat. NOT just however long the sound was going for.


deBroglie wavelength is typically only used for singular particles like electrons (hence why mass is involved) compared to sound waves which move lots of air molecules in pressure waves.

Okay, from what I understand it would be a sound wave to travel from the source and back right? So the time would be 5 seconds.

 

[CNBA3]

so with that (f = 1/5 = .2 s)

and applying that to wavelength (343/.2 = 1715 meters)

 

[CNBA3]

and so using this formula to find sound energy ("amplitude")^2 * (1/2) * speed of sound * frequency

with also finding amplitude https://www.easycalculation.com/physics/electromagnetism/amplitude-of-wave-calculator.php

the formula turned out to be (8575 dB)^2 * (1/2) * 343 m/s * .2 Hz

 

[GarrixianXD]

This isn't really helpful. T actually needs to be the time period of one wave, i.e the time it takes for one wavelength to repeat. NOT just however long the sound was going for.


deBroglie wavelength is typically only used for singular particles like electrons (hence why mass is involved) compared to sound waves which move lots of air molecules in pressure waves.

Oh yeah, right, forgot to mention the deBrogile equation is only for singular particles

I mean, you could search up how long it takes for that particular acoustic wave to repeat

 

[CNBA3]

Okay so what i can get with the recommended formulas, i would get this.

(8575 dB)^2 * (1/2) * 343 m/s * .2 Hz