Frequency (low or high sounds) and amplitude (loudness).
The ending '-ough' can sound two different ways. It can sound like an 'o' ending, such as in:doughthoughthrough (u sound)Or it can have an 'f' sound, like in:coughroughtough
sound waves are faster in water than in land, light waves are faster in land
Low or high sounds
the proper pronounciation is with a K sound Keltic, "sell-tick" is Boston being rebellious
Depends
They travel at different speeds.
write the product of 117 two different ways
many
list two ways in which our teeth are different
Two ways that you can change the sound of an instrument are tuning or adjustment of the valves. Another way to change the sound of an instrument is to change your technique of blowing or bowing technique. I am sure there are more ways but here are some ideas!
that's a flute that has two ways of sound