It is my understanding that when antimatter comes in contact with matter that there is nothing left but pure energy. And since energy and matter are interchangeable (E=Mc2) doesn’t that mean you are actually left with all matter and no antimatter...
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Well, nobody knows it exactly. Physics and other sciences can explain How things go or went, not Why. Althought there is a theory, called the M theory or the 11 dimensions theory, that gives a kind of answer to this: the M theory says that the matter is made of little strings that vibrating give [...]
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A Sample test for Third term for Class XI Physics.
This test covers the chapters
- Properties of Fluids
- Thermal Properties of matter
The pattern of the question paper is
- 5 x 1 mark = 5 marks
- 5 x 2 marks = 10 marks
- 5 x 3 marks = 15 marks
- 2 x 5 marks = 10 marks
- TOTAL = 40 marks
Click the Link to Download III term UT-physics
Categories: Model Question Papers, Plus Two Physics, previous question papers Tags: class xi, Fluids, matter, paper, Physics, properties of fluids, properties of matter, question paper, thermal properties of matter, Thermodynamics
Mani is online.
hi sir..gud aftrnun
sir..hav u heard of dark matter?
itz said dat its present evrywher in d universe…does it possess mass?
Not Everywhere, Darkmatter is matter which is not seen because they donot emit or reflect any detectable radiations or matter. Their presence is felt by gravity. Just like a blind find that things are there by feeling it. It possesses mass and that is how it is felt
bt its nt made of atoms..so hw can it b influencd by gravity??
Whatever be the elementary constituents, if there is matter there is gravity. Matter which cannot be detected, it may either be 100% absorbent or 100% transparent.
in either case, its presence is not "seen"
it constitutes about 90% of all substances in d universe..so it shud possibly b present everywer..even in our body..
If you find any discrepancy between your observed mass and felt mass (inertia) then there is a possibility
bt d felt mass cant b measured though..sir..so if dark matter is present..den the mass of every object is subjectd to vary..right?
darkmatter is not "seen" because of the absence of any radiation from it. It has gravity
yes..bt since it has mass..it wud add up to the mass of the matter in wich it is present..
By the way who said 90%? http://upload.wikimedia.org/wikipedia/commons/a/a5/080998_Universe_Content_240.jpg
It is not an easy task to explain everything via simple text chat. I recommend you go through the following links to understand dark matter and dark energy better.