Question

which variable is directly proportional to frequency?

○ wavelength
○ position
○ energy
○ velocity

Explanation:

According to the formula \(E = h
u\) (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 has no direct proportionality relation with frequency in this context. Velocity of a wave (for electromagnetic waves in vacuum \(v = c\)) is a constant and not directly proportional to frequency in the sense of a proportionality constant - type relation like energy and frequency.

Answer:

energy