Question

how to calculate wavelength?

Answer 1

Wave length =velocity /frequency

Answer 2

Formula -1

$\boxed{\sf \lambda=\dfrac{C}{V}}$

where

• $\lambda$=Wavelength
• c=speed of light in vaccum
• v=frequency of wave

Formula 2

$\boxed{\sf \lambda=\dfrac{h}{mv}}$

where

• $\lambda$=Wavelength
• h=planks constant
• m=mass of element
• v=velocity of object.