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.
14. Describe the conditions that would cause us to see each of the three basic types of spectra. What do we see in the Sunâs spectrum shown on the opening page of this chapter? 18. Describe the Doppler Effect for light and what we can learn from it. What does it mean to say that radio waves are blueshifted? Why does the Doppler Effect widen the spectral lines of rotating objects? Test Your Understanding Each of the following statements makes some type of claim. Decide in each case whether the claim could be