The speed of light in a vacuum is approximately 299,792,458 meters per second (or about 186,282 miles per second). This value is commonly denoted by the symbol "c" in physics.
Radio waves are a type of electromagnetic radiation, and they also travel at the speed of light in a vacuum. Therefore, the speed of radio waves is also approximately 299,792,458 meters per second (or about 186,282 miles per second).
On the other hand, the speed of sound waves depends on the medium through which they are traveling. In dry air at room temperature (around 20 degrees Celsius or 68 degrees Fahrenheit), sound travels at approximately 343 meters per second (about 1,125 feet per second). However, the speed of sound can vary depending on factors such as temperature, humidity, and the composition of the medium. For example, sound travels faster in denser media like water or solids compared to gases like air.