Question 51
In MRI machine, which one of the following is used
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Heat is transferred by convection in numerous examples of naturally occurring fluid flow such as: wind oceanic currents and movements within the Earth's atmosphere. Winds and ocean currents are examples of convection currents.
The sparkling of a diamond is due to the total internal reflection of light. Diamonds have a very high refractive index meaning they slow light down much more than glass and if cut in the right manner the angles of incidence can be made so that light seems to get trapped within the diamond giving it it's sparkly appearance.
Geothermal energy is thermal energy generated and stored in the Earth. The Geothermal energy of the Earth's crust originates from the original formation of the planet (20%) and from radioactive decay of minerals (80%). Current worldwide installed capacity is 10,715 megawatts (MW), with the largest capacity in the United States (3,086 MW), Philippines, and Indonesia.
Earth is also known as the blue planet because of the abundance of water on the planet.
Any object which allows light to pass through it is known as a transparent object. The colour of any transparent object is the colour of the light transmitted by it. A red rose appears red in white light because it absorbs all colours except red. However, when seen in green light, it looks black because the red colour of the rose is absorbed by the green light.
An athlete does so to build up forward momentum so that when he jumps he already has a forward motion that would be greater than that of a jump made from standing in one spot. He needs forward momentum to get a good long jump and the best way is to have a running start. In this way, he gets advantage in terms of inertia of motion which is the tendency of an object to resist a change in motion.
Infrared is used in night vision equipment when there is insufficient visible light to see. Night vision devices operate through a process involving the conversion of ambient light photons into electrons which are then amplified by a chemical and electrical process and then converted back into visible light.