Answer:
<em>Physical change is a temporary change. A chemical change is a permanent change</em>
<em>examples of physical change are freezing of water, melting of wax, boiling of water, etc. A few examples of chemical change are digestion of food, burning of coal, rusting, etc.</em>
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It is situated in period number 1.
Answer:
The correct option is D: temperature and luminosity
Explanation:
An increase in temperature will also result in an increase in luminosity. At a higher temperature, the luminosity will tend to increase due to the higher kinetic energy levels present that will enable faster movements and more frequent collisions between the molecules.
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Index of refraction is 2.
<u>Explanation</u>:
- Step 1: Given details are angle of incidence (i) = 30 and angle of refraction (r) = 15
- Step 2: Refractive Index can be calculated by the formula n = sin i/sin r
⇒ n = sin 30/sin 15
⇒ n = 0.5/0.25 = 2