What surface reflects sound best?
In general, soft, pliable, or porous materials (like cloths) serve as good acoustic insulators – absorbing most sound, whereas dense, hard, impenetrable materials (such as metals) reflect most.
What type of surfaces reflect sound waves?
Flat or plane surfaces reflect sound waves in such a way that the angle at which the wave approaches the surface equals the angle at which the wave leaves the surface. Reflection of sound waves off curved surfaces leads to a more interesting phenomenon.
What type of surface is best for canceling sound waves?
The best types of surfaces for absorbing sounds are ones with jagged surfaces and hollow recesses within (much like a sponge or cardboard). The proper object captures the sound waves and bounces them around within the object until the vibrations dwindle.
What materials conduct sound best?
A material’s elasticity or “springiness” is also important for transmitting sound: less elastic substances such as hard foams and paper are more likely to absorb sound than carry it. The best materials for carrying sound waves include some metals such as aluminum, and hard substances like diamond.
What is the best conductor of sound?
Diamond
Why we Cannot go faster than light?
“As objects travel faster and faster, they get heavier and heavier – the heavier they get, the harder it is to achieve acceleration, so you never get to the speed of light,” says Roger Rassool, a physicist at the University of Melbourne, Australia. “A photon actually has no mass,” he says.
Can neutrinos travel faster than light?
Five different teams of physicists have now independently verified that elusive subatomic particles called neutrinos do not travel faster than light. The OPERA team made headlines after they suggested neutrinos traveled 0.002% faster than light, thus violating Einstein’s theory of special relativity.
Why is C Squared?
Energy is measured in units of mass times velocity squared. Hence, the factor between mass and energy has to be (m^2 / s^2) which is some velocity squared. And the only fundamental constant we have that is a velocity is the speed of light c. That’s why it has to be c^2.
Are neutrinos dark matter?
Neutrinos could be key particles to unravel the nature of the dark matter of the Universe. On the one hand, sterile neutrinos in minimal extensions of the Standard Model are excellent dark matter candidates, producing potentially observable signals in the form of a line in the X-ray sky.
How much does dark matter cost?
It would be about 1 million trillion trillion dollars per ounce. The LUX experiment costed 10 million dollars to build.
Why is dark matter so expensive?
Due to its explosive nature (it annihilates when in contact with normal matter) and energy-intensive production, the cost of making antimatter is astronomical. CERN produces about 1×10^15 antiprotons every year, but that only amounts to 1.67 nanograms.
Is there proof of dark matter?
Because dark matter has not yet been observed directly, if it exists, it must barely interact with ordinary baryonic matter and radiation, except through gravity. Most dark matter is thought to be non-baryonic in nature; it may be composed of some as-yet undiscovered subatomic particles.
How much is a gram of dark matter?
1 gram of dark matter is worth $65.5 trillion.
What can 1 gram of antimatter do?
Antimatter-matter annihilations have the potential to release a huge amount of energy. A gram of antimatter could produce an explosion the size of a nuclear bomb. Making 1 gram of antimatter would require approximately 25 million billion kilowatt-hours of energy and cost over a million billion dollars.
Can you create dark matter?
One leading hypothesis is that dark matter consists of exotic particles that don’t interact with normal matter or light but that still exert a gravitational pull. Several scientific groups, including one at CERN’s Large Hadron Collider, are currently working to generate dark matter particles for study in the lab.
What does antimatter look like?
When you see antimatter depicted in science fiction movies, it’s usually some weird glowing gas in a special containment unit. Real antimatter looks just like regular matter. Anti-water, for example, would still be H2O and would have the same properties of water when reacting with other antimatter.
Can you touch antimatter?
When antimatter and regular matter touch together, they destroy each other and release lots of energy in the form of radiation (usually gamma rays). If it’s a small amount, it’s totally safe. If it’s a large amount, the gamma radiation would be enough to kill you or cause serious harm.