Refraction occurs when a wave changes its A) color. B) frequency. C) intensity. D) speed.
2 answers:
Explanation :
Light shows many different types of phenomena like the reflection of light, refraction of light etc.
Refraction of light is the phenomena of bending of light when it passes from one medium to another. This is due to the difference in the refractive indices of two media.
Refractive index is given by :
c is the speed of light in vacuum
v is the speed of the light in a medium.
So, refraction occurs when a wave changes its speed.
Hence, the correct option is (D) "speed".
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Explanation:
Nuclear reactions are the reactions in which nucleus of an atom changes either by splitting or joining with the nucleus of another atom.
There are two types of nuclear reactions.
- Nuclear fission - In this process, large atomic nuclei splits into smaller nuclei.
- Nuclear fusion - In this process, two small nuclei combine together to form a large nuclei.
Both nuclear fission and fusion processes involve nuclei of atoms.
For example,
Thus, we can conclude that statements which are true are as follows.
- Nuclear reactions involve the nuclei of atoms.
- The products of nuclear reactions are lighter than the reactants.