Answer: Option (A) is the correct answer.
Explanation:
An urban area is an area which is developed and it is a place where people can get almost all the things of their need easily.
Therefore, more an more people would like to live in an urban area as there will be more resources which can make people's work easy.
Hence, we can conclude that out of the given options an urban area is characterized by a dense human population.
(2) absorb energy as they move to higher energy states
(3) release energy as they move to lower energy states
(4) release energy as they move to higher energy states
The light emitted from a flame is produced when electrons in an excited state absorb energy as they move to higher energy states. Thus option 2 is correct.
Energy level diagram is defined as a graphical illustration of the energies of an atom's or molecule's various orbitals.
The energy level diagram is typically shown as a sequence of horizontal lines, with each line representing an orbital.
It can also be defined as an electron shell, or energy level, can be visualized as an orbit of electrons surrounding an atom's nucleus.
Electrons absorb energy and move from ground state to exited state, and come back to original state by releasing energy.
Thus, the light emitted from a flame is produced when electrons in an excited state absorb energy as they move to higher energy states. Thus option 2 is correct.
To learn more about energy level diagram, refer to the link below:
#SPJ2
b. buffer
c. acid
d. catalyst
(2) 2 electrons in the first shell
(3) 3 electron shells
(4) 22 neutrons
2) empirical formulas
3) molecular structures
4) physical properties