Q4 of 45 Page 544

Which phenomenon is responsible for making the path of light visible?

The scattering of the light is the phenomenon responsible for making the path of the light visible.


When the light travel throught the atmosphere due to the presence of the air and dust molecule led light to scatter which led this particles to get reflected which fall in the path of the light which is responsible for making the path visible.


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2

Name the elements which has:

(i) a total of three shells with three electron in its valence shells.


(ii) Half as many electronic in its third shell as in its second shell.

 3

(i) Name the bond formed when X714 combines with Y918 .

(ii) Write the chemical formula of the compound formed when X714 combines with Y918 .

 5

When a battery is connected to a closed circuit, charge flow in the circuit almost instantaneously. Why?

 6

Why are the coal, petroleum and natural gas called fossil fuels?