edwin hubble measured the redshifts and distances of many galaxies and found that the redshifts of a galaxy depends on its

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz.

Modern physics a photon emitted from an excited hydrogen atom has an energy of 3.02 electron volts. which electron energy-level transition would produce this photon? a. n=1 to n=6 b. n=2 to n=6 c. n=6 to n=1 d. n=6 to n=2 i chose b but the correct answer is d can someone tell me why? and what's the difference?

Wavelength,frequency,and energy are related.what happens to a wave as it’s wavelength gets shorter?