Adiffraction grating that has 4500 lines/cm is illuminated by light that has a single wavelength. if a second order maximum is observed at an angle of 42° with respect to the central maximum, what is the wavelength of this light?

Hydrogen and helium are both members of?

Awater-filled u-tube manometer is used to measure the pressure inside a tank that contains air. the water level in the u-tube on the side that connects to the tank is 5 ft above the base of the tank. the water level in the other side of the u-tube (which is open to the atmosphere) is 2 ft above the base. determine the pressure within the tank.

The substances that are necessary for producing of certain hormones and that store and transport vitamins