Physics, asked by KingOMac1, 1 year ago

Hi mates,
Class 11 question,


Pls answer urgently

Suppose you are told that the linear size of everything in the universe has been doubled overnight. Can you test this statement by measuring sides with a measure stick? Can you test this statement by using the fact that the speed of light is a universal constant and has not changed? What will happen if all the clocks in the universe also start running at half the speed?


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Answers

Answered by piyushsingh81255
2

I must say, people on Quora ask such intriguing questions!

Since all the measuring instruments would also double in size, it's obvious that we cannot come to know that the size of everything has doubled by measuring the length of things

But there  are many other ways by which you can come to know about this 'overnight' change

I am not sure what do you mean by 'linear size', I shall consider that the sizes of objects have doubled in all the 3 dimensions (only then would they retain their shape, or else everything  would be distorted)

Now the mass of everything would remain same, only their volume would increase

one-fourth

of what would you used to weigh before, because the radius of the earth has doubled, and your weight is given by GM/r^2

one-eighth

same temperature,

Since the moles of gas in the flask is the same, then at the

From

PV=nRT

Again, I don't think the pressure measuring instrument should be affected

of the previous pressure of the gas, because the volume has become eight times (since radius has doubled and

Also, as you mention in the question, since the speed of light would be the same, light would take twice the time to traverse the length of an object

Furthermore, it is obvious that the length of everything has doubled not due to the doubling of the length of the fundamental particles which make up the object, but due to increase in the void space between atoms

This means the physical properties of everything would be altered drastically, for example, an iron rod would now melt much before its melting point, all metallic objects would become easy to break/stretch and so on...

the same

The universe would now be very much different although it

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