How does the sound sound on Mars and Venus?
And how thick an atmosphere must be to propagate sound that is human ear able to hear?

The speed of sound will be an important factor:-
http://en.wikipedia.org/wiki/Speed_o...ses_and_in_air

I worked it out for Venus once. It wasn't too much faster than on Earth due to the much lower adiabatic index offsetting the density.

But I once read that with increasing pressure, the sound becomes increasingly louder.Is that true?

This makes Venus the ideal place for retirement homes.

You need Alien Soundscapes.

Grant Hutchison

Huh interesting....so in medium pressure 1-2 bar enviroments like on Earth or Titan it sound normally, with Titan's sound louder because of mildly higher pressure but Venus extremely hi-pressure enviroment is interesting - weak and bassy...why they do not included Mars....

Mars' atmosphere is too thin to conduct much audible sound.

__________________
"If this were play'd upon a stage now, I could condemn it as an improbable fiction."
Shakespeare, Twelfth Night
"The Mayan symbol for "book" looks a lot like a triple hamburger, but I've never seen them claiming it as proof the Mayans had Big Macs." - KaiYeves
"Distance doesn’t matter much in space, where if you just start a thing off with the right kind of shove, sooner or later it will get where you want it to go." -Frederik Pohl, Mining the Oort

He tells you on the webpage: "The 'Mars filter' is much too attenuative due to the tenuous CO2-based atmosphere, so I didn't include it."

Grant Hutchison

Stop babbling, I WANT TO HEAR IT MY EARS ARE YOUNG.

"Not much?!"
I AM SURE IF I DETONATED AN ATOMIC BOMB ON MARS IT WOULD BE LOUD ENOUGH!

And besides that Mars Polar Lander had a microphone on it - unfortunatelly it was lost
And that microphone was going to record SOUND AUDIBLE BY HUMANS.

Look at the graphs, read the webpage, and stop being rude.
Mars' atmosphere has a thousand times the attenuation of Earth's.

Grant Hutchison

Also the sound of some hard rock or heavy metal would be certainly audible even on Mars...I WANNA TO HEAR KORN CONCERT AS IT WOULD SOUND ON MARS..ahhh..please !

This is rude?!I could be rude......
You obviously do not seen any REALLY RUDE forum....
Go to some non scientific common inet chatroom...

...by using a microphone much more sensitive than human ears.

__________________
"If this were play'd upon a stage now, I could condemn it as an improbable fiction."
Shakespeare, Twelfth Night
"The Mayan symbol for "book" looks a lot like a triple hamburger, but I've never seen them claiming it as proof the Mayans had Big Macs." - KaiYeves
"Distance doesn’t matter much in space, where if you just start a thing off with the right kind of shove, sooner or later it will get where you want it to go." -Frederik Pohl, Mining the Oort

I'd advise against it, if you want anyone to answer any more of your questions.
I've certainly just lost interest.

Grant Hutchison

m1omg, Calm down.

That's why this site is the best - it's not like all those other rude internet forums/chatrooms.

I appologise.