While preparing an experiment of a scale model submarine in a wind tunnel, for conditions of dynamic similarity, it is calculated that the wind speed is required to be 120 m/s. Which one of the following options will not help to reduce the air velocity of the wind tunnel?                       A) Lowering the design velocity of the prototype (full scale) submarine                        B) Increasing the pressure of the air used in the wind tunnel                        c) Increasing the size of the scale model                        D) Decreasing the density of air used in the wind tunnel                       E) Reducing the temperature of the air used in the wind tunnel

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Radiation

Radiation can be described as the energy in the form of a particular matter or electromagnetic waves traveling in the air and can be in the form of light, sound, and heat. Radiation can be detected through special instruments like X-rays. The radiation from a cooler object is less intense as compared to the radiation from hot objects.