How is the band gap `E_g` of a photodiode related to the maximum wavelength `lambda_m` that can be detected by it?

Which graph shows how the energy E of a photon of light is related to its wavelengths (lamda) ?

Give relation among the speed of sound v, wavelength lambda and frequency v.

How g and G are related?

The energy and momentum of an electron are related to the frequency and wavelength of the associated matter wave by the relation: E=hv, p=h/lambda . But while the value of lambda is physically significant, the value of v (and therefore the value of the phase speed v lambda ) has no physical significance. why?

How are the wavelength and frequency of a sound wave related to its speed ?

A proton and an alpha-particle are accelerated using the same potential difference. How are the de-Broglie wavelengths lambda_p and lambda_alpha related to each other?