Structures on a bird feather act like a diffraction grating having 8000 8000 lines per centimeter. what is the angle of the first-order maximum for 452 nm 452 nm light shone through a feather?

What are atoms of the same element with varying number of neutrons

The softest and hardest minerals are: softest hardest

Afisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. it takes a time of 2.20 s for the boat to travel from its highest point to its lowest, a total distance of 0.670 m . the fisherman sees that the wave crests are spaced a horizontal distance of 5.80 m apart. (a) how much is the wavelength? (b) find the period of the wave. (c) how fast are the waves traveling? (d) what is the amplitude a of each wave?