Can we apply this equation `c = upsilon lambda` , to a sound wave '?

Establish the relation v = upsilon lambda , where v rarr speed of wave upsilon rarr frequency, lambda rarr wavelength.

Can we apply the principle of superposition to both types of waves ?

If equation of a sound wave is

Equation Of Sound Wave

a. Every metal has a definite work function. Why all photoelectrons do not come out with the same energy of incident radiation in monochromatie ? Why there is an energy distribution of photoelectrons? b. The energy and momentum of an electron are related to the frequency and wave-length of the associated matter wave by the relations, E=h upsilon, p=(h)/(lambda) But while the value of lambda is physically significant, the value of upsilon (and therefore the value of the phase speed upsilon lambda has no physical significance. Why?

Whether can we apply c = va to sound waves ?

By obtaining the equation of speed of sound wave, obtain equations of sound wave in different medium.

Sound waves of wavelength lambda travelling in a medium with a speed of upsilon m//s enter into another medium where its speed is 2upsilon m//s. Wavelength of sound waves iin the second medium is

Sound waves of wavelength lambda travelling in a medium with a speed of upsilon m//s enter into another medium where its speed is 2upsilon m//s. Wavelength of sound waves iin the second medium is