The shortest wavelengths occur in the: red end of the spectrumblue end of the spectrummiddle of the spectrum the light-gathering capacity of a telescope is dependent upon the: magnificationfocal lengthsize of human irisarea of aperture

One day, after pulling down your window shade, you notice that sunlight is passing through a pinhole in the shade and making a small patch of light on the far wall. you see that the patch of light seems to be a circular diffraction pattern. it appears that the central maximum is about 1 cm across and you estimate that the distance from the window shade to the wall is about 3 m. what is (a) the average wavelength of sunlight? (b) the diameter of the pinhole?

Aballet student who learns with the of his instructor is demonstrating learning.

Explain why electric current cannot exist if a current doesn't have a voltage source.