How does the greenhouse effect work? Why is it called that? What effect does it have on the temperature of the Earth?

Which type of microscope would allow the viewer to see ribosomes inside a cell?

Who was the first scientist to measure speed as distance over time?

Light from a sodium lamp passes through a diffraction grating that has 1000 slits per millimeter. the interference pattern is viewed on a screen 1.000 m behind the grating. the first (m = 1) two bright yellow fringes that are visible are 0.7288 m and 0.7300 m from the central maximum. what are the wavelengths of these two fringes?