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.
Objectives. 1  Identify wave characteristics of frequency, wavelength, wave speek, and amplitude. 2  Identify and describe examples of longitudinal and transverse waves. 3  Describe the behavior of waves when they interact; constructive and destructive interference, standing waves. 4  Explain the Doppler Effect.