1 Many people find that boxes with a 1.25 or 1 1/8 hole restrictor on them before an egg is laid are not utilized, even by smaller birds like titmice and chickadees. 2  If the entrance hole is enlarged (e.g., by woodpeckers or chewing rodents), put a hole reducer on it.
The Doppler effect widens the spectral lines of rotating objects because the wavelengths changes from blue or red. Blue-shifted, red-shifted, and non-shifted photons mix together to get how its rotating.
Answers. Best Answer: Instruments on Hubble can measure Doppler's Shift of the light of galaxies. If the galaxies are moving away from us there is a Red shift of the light. And at what angle. If the galaxies are moving toward us, there is a Blue shift in the light.And at what angle.Then use semi-complex math to figure how the galaxies are moving in their calculated position in the Universe.est Answer: Instruments on Hubble can measure Doppler's Shift of the light of galaxies. If the galaxies are moving away from us there is a Red shift of the light. And at what angle.