Answer:
By absorbing energy electron is jump into higher energy level. This is called excitation.
Explanation:
The electron is jumped into higher level and back into lower level by absorbing and releasing the energy.
The process is called excitation and de-excitation.
Excitation:
When the energy is provided to the atom the electrons by absorbing the energy jump to the higher energy levels. This process is called excitation. The amount of energy absorbed by the electron is exactly equal to the energy difference of orbits. For example if electron jumped from K to L it must absorbed the energy which is equal the energy difference of these two level. The excited electron thus move back to lower energy level which is K by releasing the energy.
De-excitation:
When the excited electron fall back to the lower energy levels the energy is released in the form of radiations. this energy is exactly equal to the energy difference between the orbits. The characteristics bright colors are due to the these emitted radiations. These emitted radiations can be seen if they are fall in the visible region of spectrum.
Answer:
B
Explanation:
Bias may make one side look worse than they actually are.
You can change any variable in an experiment (the amount of water, sun, type of light, fertilizer etc.) but for the experiment to be VALID only one thing can be changed for the experiment.
Example: I’m trying to see if the plant will grow better with more or less water so the only thing that changes is the amount of water. Everything else will have to be the same (type of plant, fertilizer,dirt, container it grows in, amount of light etc.)
Answer: All cells need energy, which they get through ATP, an inherently unstable molecule that must continually be produced. Though ATP can be produced in different ways, nearly all living cells can harness ATP through glycolysis, the stepwise degradation of glucose, and other sugars, obtained from the breakdown of carbohydrates without the need for molecular oxygen (anaerobic). Glycolysis is an ancient, universal pathway that probably developed before there was sufficient oxygen in the atmosphere to sustain more effective methods of energy extraction.
Explanation:
Anything that happens on Earth leaves a record in the rocks: sandstone is the remains of sands that were once sediment in a river or ocean, lava is the remains of past volcanic eruptions, fossils are the remains of once-living things that got buried and preserved. Additionally, there are some simple logical rules as well: if you lay some layer of sediment or rock down from the water, then it will be lying on top of whatever was underneath it, and, therefore, younger sediments will be on top of older sediments.
The predictions come from what we call the "principle of uniformitarianism", which states that the processes acting on the earth in the past are the same as the processes acting on the earth today and are the same as the processes that will act on the earth in the future. This is an assumption that we make, indeed that all science makes, which is that the universe has rules that describe how it behaves. For instance, if we look at the debris from a flood that happened yesterday, and then we look at debris from the past that look the same, we can infer that the previous debris were created in a flood. If we look through the record and see that floods of some scale happen every thousand years or so, then we can predict that they will continue to do so into the future.