Answer:
In second time period will be ![1.4\times 10^{-6}sec](https://tex.z-dn.net/?f=1.4%5Ctimes%2010%5E%7B-6%7Dsec)
Explanation:
We have given the time period of wave ![T=1.4microsecond](https://tex.z-dn.net/?f=T%3D1.4microsecond)
We have to change this time period in unit of second
We know that 1 micro sec ![10^{-6}sec](https://tex.z-dn.net/?f=10%5E%7B-6%7Dsec)
We have to change 1.4 micro second
To change the time period from micro second to second we have to multiply with ![10^{-6}](https://tex.z-dn.net/?f=10%5E%7B-6%7D)
So ![1.4microsecond =1.4\times 10^{-6}sec](https://tex.z-dn.net/?f=1.4microsecond%20%3D1.4%5Ctimes%2010%5E%7B-6%7Dsec)
If ozone layer is completely removed then many severe effects can be seen in the temperature of the earth.
- The ice in the Antarctica starts getting melt which increases the level of water in ocean and proved to be harmful for the coastal areas.
- The rise in temperature also lead to long summers and high temperatures ranges from 50° C to 65° C .
Explanation:
The removal of ozone layer will not only effect the temperature but also had a great impact on human and animals such as
- The harmful rays will directly fall on earth in the absence of ozone cause cancer in animals, plants and humans.
- These harmful rays weaken the immune system.
- Lead to disturbance of food chain in following ways : -
- It will led to increase in herbivores as a result, the number of plants will decrease and the amount of oxygen will also decrease in the atmosphere.
- The carnivores keep the population of other carnivores and herbivores in check. This will disturb the balance of ecosystem.
- The concentration of harmful chemicals is maximum at the last trophic level . Because these chemicals are not degradable, these get accumulated progressively at each trophic level.
Volume of the original block (V) of length (l), width (w) and height (h) is given by the following equation
![V = l*b*h](https://tex.z-dn.net/?f=V%20%3D%20l%2Ab%2Ah)
hence volume of original block, V = (6)(4)(10) = ![240 cm^{3}](https://tex.z-dn.net/?f=240%20cm%5E%7B3%7D)
Now say we cut this block in two equal parts, than the length of new block will be
; where as its width and height will be same as of original block i.e. 4 cm and 10 cm respectively.
So, Volume of half-block is
; or we can say that the volume of half-block is half that of orignal block.
The question in choice-C is the correct answer to your question.
(Is this confusing ?)