Sound waves can travel through any substance, including gases such as air , liquids such as water , and solids such as the seafloor. For example, sound cannot travel through outer space because it is a vacuum that contains nothing to carry sound. Even though sound waves in water and sound waves in air are basically similar, the way that sound levels in water and sound levels in air are reported is very different, and comparing sound levels in water and air must be done carefully. When we describe a sound as loud or soft, scientists say that the sound has a high or low amplitude or intensity. Amplitude refers to the change in pressure as the sound wave passes by. If you increase the amplitude of a sound, you are making it louder, just as you do when you turn up the volume on your radio. If you decrease the amplitude, you are making the sound softer, just as when you turn down the volume.
How does sound in air differ from sound in water?
Ask the Physicist!
Their sex. We've collected for you the most unusual Old Grandmothers pictures and placed them into albums up to 16 images in each one for your convenience and separated it all into a channels. Mature Tubes, granny tube videos featuring grandma, housewives, mom, old babes, mother and housewife tubes. The 1 free mature porn resource: Older Tube. Description: Brenda decides to break a couple things around the house so Ramon will have to help her out.
Old Questions & Answers (#6)
Click on the book images below for information on the content of the books and for information on ordering. Is there something about the fabric of space that causes it to move at the speed it does? The real question is "why is the speed of light in a vacuum a fundamental constant of nature? If we stopped the earth in orbit and then let it fall straight towards the sun, how long would it take to reach the sun in seconds? ANSWER: The questioner sent me a bunch of data about the masses of the sun and earth, the radius of the earth's orbit, and Newton's universal constant of gravitation.
When it comes to a sperm fertilizing an egg, it all comes down to speed and timing. If the sperm starts swimming at top speed too soon, it will die before it reaches the egg. Now, scientists have discovered a system in the sperm that acts like a gas pedal, causing the sperm to swim faster as it gets closer to the egg. The findings were published in the February issue of Cell.