Answer the following questions with a picture only PLEAS. 1. What is the main source of energy for ecosystems?

2. What are some natural things that can disturb ecosystems?

Determine the wavelength of the light absorbed when an electron in a hydrogen atom makes a transition from an orbital in the n=3 level to an orbital in the n=7 level.

Find the mass in grams of 1.37x1020 particles of h3po4

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line