Answer:
b. wavelength
Explanation:
The following quantities are used to describe a wave:
- Frequency --> it is the number of complete cycles/oscillations of the wave per second. Generally represented with [tex]\nu[/tex] or f.
- Wavelength --> it corresponds to the distance between two successive crests (or between two successive troughs) of a wave. Generally represented with [tex]\lambda[/tex]
- Quantum number --> for a wave, the following quantity
[tex]k=\frac{2\pi }{\lambda}[/tex]
is called quantum number of the wave
- Velocity --> the velocity of a wave is given by the product between wavelength and frequency:
[tex]v=f\lambda[/tex]
Therefore, the correct answer is b. wavelength.
