Question

which variable is directly proportional to frequency? energy wavelength position velocity

Explanation:

According to the Planck - Einstein relation \(E = h
u\) (where \(E\) is energy, \(h\) is Planck's constant, and \(
u\) is frequency), energy is directly proportional to frequency. Wavelength \(\lambda\) and frequency \(
u\) are related by \(c=\lambda
u\) (where \(c\) is the speed of light), so they are inversely proportional. Position and velocity are not directly related to frequency in a simple proportionality like energy is.

Answer:

energy