Answer:
A cosmic year is 365.25 days, some times called a side real year and is just the time it takes for us to go round the sun once.
A light year is the distance light travels in a year. Now light travels at about 186,262 miles a Second! Which is not slow by any ones book.
An experiment was conducted just after Christmas a few years ago. Two girls were selected from the audience and went into two phone boxes a few feet apart. They could only hear each other via the phones. The phone call went to a ground station about 200 miles away, then up to a geostationary coms satellite, back to a ground station 1/3 of the way around the world, then repeated, with a third satellite before being sent from another ground station back to London and the other phone box. We the audience could hear both sides of the conversation from both boxes. And could hear the delay between sending and receiving. So even at the speed of light, there was about 1.5 seconds of delay. So because distances in space are so vast that saying a star is x millions of miles away causes problems, you run out of zero’s! So our nearest other star is about 4.5 light years away. Our sun (our nearest start) is about 8 light minuets away. Varies slightly as our orbit is not 100% cirular.
I HOPE THIS IS HELPFUL.
Answer:
By using the Physical property we can tell the difference between matter and mass
Explanation:
Answer:
The process of making alloys involves ( Heating ) pure metals to remove impurities. Then the pure metals are(mixed) with other components. An alloy is a mixture of metals or a mixture of a metal and another element. Alloys are defined by a metallic bonding character.
Explanation:
Answer:
Wavelength of sound wave corresponding to 20 Hz frequency will be 17.95 m
Explanation:
We have given that range of human hearing extends from 20 Hz and 20000 Hz
Velocity of sound wave is given 359 m /sec
We have to find the wavelength of the sound wave corresponding to 20 Hz
We know that velocity of sound wave is given by 
, here v is velocity 
is wavelength and f is frequency
So 
So wavelength of the sound wave corresponding to 20 Hz frequency will be 17.95 m
Answer:
Solids have definite shapes while liquid fill their containers.
Explanation:
Liquids have got further apart molecules than solids, so the liquid molecules have a higher degree of locomotion than solid molecules, hence able to fill the container though without a definite volume which is not the case for solid molecules.
