Recent content by physics_06er

Hi can u please see if i have the calculations right- room has circular floor area of 1285m^2 (radius approx. 20m) height=15m the floor is wooden, walls/ceiling mainly plastered and but quarter of wall covered by hearvy drapery i have ti estimate reverberation time at 2000Hz absorption...

and if a room had a circular floor area eg: 1285m^2 (approx radius 20m) and ceiling height 15m??--would would the calculation there be?? Thanks in advance physics_06er

Hi could someone please tell me if I have answered these correctly? 1)-Explain how traveling waves can be formed by traveling waves, and hence how the freq's. of a standing waves in an open tube are related to the speed at which sound travels along the tube? travelling waves formed when to...

Hi Thanks fo rthe reply But say you eat protein that is a-1 b-10 c-10, would 'b' and 'c' still "work"

-------------------------------------------------------------------------------- Hi there When talking about limiting amino acids what does it really mean... What I think it means is say we have a food eg wheat it has all the essential amino acids (aa) in it except one of them is not...

Hi there Can someone please help me with this question I have no idea how to work it out... A tuning called 'philosophical pitch' has C4 (Middle C) at 256Hz. What is the difference in cents between notes at this pitch standard and those in modern concert pitch (A4 at 440Hz)? Thanks in...

Hi there Could someone please help with these questions. A helmholtz resonator has a resonant freq. of 100Hz. draw graphs showing how the pressure and displacement of the air in the neck vary with time. how would these be different at the position of a listener some distance away... i...

hmmm ok i think i get this now...ill go find other examples and see if its certain i know,,thank you for all youe help-sorry for all the q's..and once again thanks for the help

nooo...this is from my high school book If P is pressure and a is amplitude P is proportional to a2 This can be written as an equation P = ka2, where k is a constant of proportionality If we double the amplitude, that is put a=2a, then P = k(2a)2 = 4ka2 = 4 * original P...

Hi if we halve r-the area decreases hence power density decreases if power varies with the square of amplitude-then amplitude is 4*original P

ohhh ok i get it now!--as I was looking through my textbook I did come across I=P/4pir^2 but didn't think much of it cos I wasn't sure how it was related!...thank you so much...so just to make sure--if i halve r it means that that the sound level now is 0.25 of that hence 53x0.25=13.25dB? and...

I also have another problem which I'm unsure about- a trombone played fortissimo in the lower part of its range, around C3 (131Hz), has a sound level of about 100dB at a distance of 3m. A violin played fortissimo in the lower part of its range, around C4 (262Hz), has a sound level of about...

OK..the relationship between pressure/amplitude is that the pressure is proportional to amplitude squared and the relationship between sound level is sound level=power/area, so if area decreases the sound level increase. Therefore if the distance (hence amplitude) is halved then the...

does the power decrease with distance?...if that is correct and amplitude is a mease of sound's power then it too must decrease right?...then if the pressure amplitude is 8.934x10^-03N/m^2 and the distance is only half-sized now then pressure amp. is itncreased to double and seeing as amplitude...

Hi there Just wondering I have been given a problem asking me for the pressure amplitude of sound level of a flute 53dB...I am able to do this...then it asks me what the pressure amplitude and sound level would of the flute would be if it the flute were only one-half of the distance away...