What does it mean to play perfect fifths

[Majestic Mastermind]

I know like the perfect fifth of B is F#, or the perfect fifth of C is G.

But what do they mean when they say "PLAY" the perfect fifth.

For example, if i played the perfect fifth of B minor, i would just play WITHIN the perfect fifth? I.E. between B and F.

or what?

Please explain this simply, because i'm not a music theory expert, but i do know scales, chords and progressions, that's about it.

 

[Axxe]

I would think it just means to play the note a fifth apart...

 

[Dope(Envoy)]

Yeah, I guess the perfect fifth of A is E, so i guess if someone told me to play the perfect fifth of A, I'd play E.

 

[Taybot]

isn't F the perfect 5th of B, and not actually F#?

if not, why?

 

[GreenOnion]

F would be the diminished fifth in the scale of B. F# would be the perfect fifth in B because its 7 semi-tones away from B which makes it "perfect".

 

[Dope(Envoy)]

Yeah, because in both b minor and major there is an f#, the 5th is the same in minor and major scales,