is this belt noise?

[george james]

While coasting (maybe during acceleration, engine is possibly drowning it out) i hear a roar/whine that rises then falls in sound level. If it is belt noise will spraying water on it make the noise change temporarily to assure me it is the belt? 4500miles, 2011 nomad,tire 80% worn, went on 70 mile 2 up ride and noise started after i left home. Thx for u'r input......by the way belt running position on pully is same as always.