Answer:
Atoms are electrically neutral as a result of having an equal amount of positive (due to the protons) and negative (due to the electrons) charges on it.
An ion generally is an electrically unbalanced atom (i.e an atom with a net charge on it)
A negative ion called an anion is produced when an atom gains an extra electron from a neighboring atom, giving it an extra negative charge. This can be produced by ionization with a radioactive radiation or simply by dissolution.
A positive ion is called a cation and it is produced when an atom loses electron to a neighboring atom. The loss of this electron causes the positive charges to outweigh the negative charges in the atom. Cations can be produced by radioactive radiation ionization of an atom or by simple dissolution.
The subatomic particle that is negative is the 'electron'.
It is used to demonstrate the importance of chlorophyll in photosynthesis. Plant with variegated leaves is de starched and then placed in the sunlight for a few hours, then the iodine test for starch is carried out. The green parts of the leaves will test positive for starch and therefore turn blue black. The non-green parts did not photosynthesize die to absence of chlorophyll and iodine color will remain brown.
Hormones are chemicals from endocrine glands, and neurotransmitters are chemical signals from neurons. Hormones are electric impulses sent from endocrine glands, and action potentials are electric signals sent through neurons. Endocrine glands and neurons both send their messages through the bloodstream. Endocrine glands and neurons both use electrical signals.
I think it might the both common is using electric signal.
Most neurons have only one axon. An axon is the part of the neuron that transmits nerve signals away from the soma to other neurons ....Endocrine signaling occurs when endocrine cells release hormones that act on distant target cells in the body.
Refer to textbook..
Answer:
Low frequency red light is used in Dark rooms because it does not expose the film, this is because the red light has low energy.
Explanation:
- Red light is used as a safe light in the dark room because it has lowest energy and cause least damage to the photosensitive material used in photographic plate.
- Among the lights of visible spectrum, violet has the highest frequency thus highest energy and red light has the lowest frequency and lowest energy.
- Wavelength being inversely proportional to frequency ,is highest for red light and lowest for violet light.
- The frequency and energy level of the colors decreases as: Violet> indigo>blue> green> yellow>orange>red.
