Which of the following correctly shows the four most abundant gases in the earth's atmosphere in order from most abundant to least abundant? a. oxygen, nitrogen, argon, carbon dioxide b. nitrogen, oxygen, argon, carbon dioxide c. oxygen, nitrogen, carbon dioxide, argon d. nitrogen, oxygen, carbon dioxide, argon

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?

An object resting on a table weighs 100 n. with what force is the object pushing on the table? with what force is the table pushing on the object? explain how you got your answer.

When using the scientist method, which step comes last?