Explanation:
Convection is primarily a mode of heat transfer which involves the movement of the particles of the medium. It is most notable in fluids i.e liquids and gases.
Gases makes up the atmosphere. Liquids makes up the ocean. Therefore, convection is possible in them.
The process of convection in the atmosphere and ocean is primarily due to density differences.
- In the ocean, heat from the sun warms the surface water and it is lighter. The water below is dense. As the surface water loses its heat, it becomes dense and therefore sinks. The sinking water is replaced by the cold water from below. This sets up the ocean currents powered by convection.
- In the atmosphere, air close to the ground is very warm. Warm air is light and it will rise. The air high up is cold and it will sink. The cold air will replace the warm air and vice versa. This is the convection in the atmosphere.
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Conductor = Radiator , Frying pan , Ceramic baking dish
Insulator = Winter coat , Oven mitt and ice chest
Answer:
physical change because the gaseous water is chemically the same as the liquid
Explanation:
Matter can be defined as anything that has mass and occupies space. Any physical object that is found on earth is typically composed of matter. Matter are known to be made up of atoms and as a result has the property of existing in states.
Generally, matter exists in three (3) distinct or classical phases and these are; solid, liquid and gas.
A physical change can be defined as a type of change that only affects the physical form of a chemical substance (matter) without having any effect on its chemical properties. Thus, a physical change would only affect the physical appearance and properties of a chemical substance (matter) but not its chemical properties.
This ultimately implies that, a physical change result in a change of matter from one form or phase (liquid, solid or gas) to another without a corresponding change in chemical composition.
Hence, the boiling of water is considered to be a physical change because the gaseous water is chemically the same as the liquid i.e there isn't any changes in chemical composition of water when boiling.
Answer: 4.99×10²³ photons
Explanation: The energy of a photon is given as
E= hf
h= Planck constant = 6.626×10^-34Js
f= frequency = c/x
C= speed of light = 3×10^8 m/s
x= wavelength= 525nm= 525×10^-9
E= hc/x
E= 6.626×10^-34 × 3×10^8 m/s /( 525×10^-9)
E= 3.79×10^−19 J/ Photon
E= 3.79×10^−22KJ/Photon
189KJ/3.79×10^−22KJ/photon=
4.99×10²³photons.
Therefore the number of photons is
4.99×10²³photons.