For potassium metal, the work function φ (the minimum energy needed to eject an electron from the metal surface) is 3. 68 × 10−19 j. Which is the longest wavelength of the following which could excite photoelectrons?.

The graph shows the populations of two species in a particular region over two decades. based on the graph, what can you conclude about the relationship between the two species? a. the two species have a parasitic relationship. b. the two species are mutualistic in nature. c. the two species exhibit commensalism. d. the two species have a prey-predator relationship. e. the two species have a familial relationship.

Earth takes in thermal energy from the sun in a process called . sunlight strikes earth’s surface at different angles. this angle is called the angle of . btw its

Tissues that carry food water and nutrients throughout the plant