Rumble that's all I know. Gomen. I tried right?
Rain, radio rub, etc
It is the sentence that contain sound and the sentence starts with letter R. thank you!
Jet engine, jump, jaguar, jazz
You can hear the sound from an owl, ocean, oboe, orchestra and organ. They begin with the letter O.
knock knock and many more such as Kick, Kids, Knife, etc.
Reticulated Python
Typically The ref blows a whistle, then drops the puck shortly after.
No, unicorn does not start with a short U sound. It starts with a long U sound.
An Egyptian word that starts with a r is Ramses
One brand of sandals that starts with R is Ryka.
noises
The iconic sound effect heard in Star Wars movies that is often described as a "laser sound" is the blaster sound effect.
The sound pressure decreases with distance after the distance law 1/r. (No squre!) Our ear drums are only moved by the sound pressure of the air. Scroll down to related links and look at "Inverse Distance law".