## Sounds of Music C

Test your knowledge of various Science Olympiad events.
terence.tan
Member
Posts: 177
Joined: September 17th, 2017, 10:40 am
Division: C
State: NY
Has thanked: 0
Been thanked: 0

### Sounds of Music C

If the frequency of the note C3 is 125 Hz, what is the frequency of A♭4?
2017 events: Electric Vehicle, Game On, Robot Arm
2018 events: Mouse Trap Vehicle, Game On, Mission Possible, ExpD, Duct Tape Challenge
2019 events: Mouse Trap Vehicle, Sounds of Music, Mission Possible, ExpD, Wright Stuff, WIDI
2020 events: Gravity Vehicle. ExpD, WIDI, Sounds of Music, Machines

Giantpants
Member
Posts: 141
Joined: February 7th, 2019, 5:42 am
Division: C
State: NY
Has thanked: 13 times
Been thanked: 17 times

### Re: Sounds of Music C

terence.tan wrote:
September 7th, 2019, 9:20 am
If the frequency of the note C3 is 125 Hz, what is the frequency of A♭4?
I got 397 Hz, using frequency of a note = known frequency * (1.059463...)^number of halfsteps, which was 8 from C4 (250 Hz)
President, Kellenberg, 2018-2020
Bro. Joseph Fox, 2014-2017

2020 Events: Dynamic Planet, Geologic Mapping, Sounds of Music, Astronomy
Giantpants's Userpage

terence.tan
Member
Posts: 177
Joined: September 17th, 2017, 10:40 am
Division: C
State: NY
Has thanked: 0
Been thanked: 0

### Re: Sounds of Music C

Giantpants wrote:
September 8th, 2019, 9:49 am
terence.tan wrote:
September 7th, 2019, 9:20 am
If the frequency of the note C3 is 125 Hz, what is the frequency of A♭4?
I got 397 Hz, using frequency of a note = known frequency * (1.059463...)^number of halfsteps, which was 8 from C4 (250 Hz)
Yep. Thats right!. Now your turn.
2017 events: Electric Vehicle, Game On, Robot Arm
2018 events: Mouse Trap Vehicle, Game On, Mission Possible, ExpD, Duct Tape Challenge
2019 events: Mouse Trap Vehicle, Sounds of Music, Mission Possible, ExpD, Wright Stuff, WIDI
2020 events: Gravity Vehicle. ExpD, WIDI, Sounds of Music, Machines

Giantpants
Member
Posts: 141
Joined: February 7th, 2019, 5:42 am
Division: C
State: NY
Has thanked: 13 times
Been thanked: 17 times

### Re: Sounds of Music C

You’re tuning a bass guitar and for some reason have an obsession with knowing the tension of your strings. How much tension will you need to apply to your top string, G2, so that it is tuned properly if it’s 90 cm long and has a mass of 16 grams? (G2 = 98 Hz)

(Tried to make the numbers at least somewhat realistic lol)
President, Kellenberg, 2018-2020
Bro. Joseph Fox, 2014-2017

2020 Events: Dynamic Planet, Geologic Mapping, Sounds of Music, Astronomy
Giantpants's Userpage

UTF-8 U+6211 U+662F
Exalted Member
Posts: 1522
Joined: January 18th, 2015, 7:42 am
Division: C
State: PA
Has thanked: 0
Been thanked: 0

### Re: Sounds of Music C

Giantpants wrote:
September 8th, 2019, 9:49 am
terence.tan wrote:
September 7th, 2019, 9:20 am
If the frequency of the note C3 is 125 Hz, what is the frequency of A♭4?
I got 397 Hz, using frequency of a note = known frequency * (1.059463...)^number of halfsteps, which was 8 from C4 (250 Hz)
Interrupting for a second... doesn't this depend on your tuning system?
Giantpants wrote: You’re tuning a bass guitar and for some reason have an obsession with knowing the tension of your strings. How much tension will you need to apply to your top string, G2, so that it is tuned properly if it’s 90 cm long and has a mass of 16 grams? (G2 = 98 Hz)

(Tried to make the numbers at least somewhat realistic lol)
550 N?

Giantpants
Member
Posts: 141
Joined: February 7th, 2019, 5:42 am
Division: C
State: NY
Has thanked: 13 times
Been thanked: 17 times

### Re: Sounds of Music C

UTF-8 U+6211 U+662F wrote:
September 21st, 2019, 5:40 pm
550 N?

Yea, I got 553.19 N specifically, but still good. Your turn!
President, Kellenberg, 2018-2020
Bro. Joseph Fox, 2014-2017

2020 Events: Dynamic Planet, Geologic Mapping, Sounds of Music, Astronomy
Giantpants's Userpage

UTF-8 U+6211 U+662F
Exalted Member
Posts: 1522
Joined: January 18th, 2015, 7:42 am
Division: C
State: PA
Has thanked: 0
Been thanked: 0

### Re: Sounds of Music C

What are the five main groups in the Hornbostel-Sachs system?

smayya337
Member
Posts: 78
Joined: November 2nd, 2017, 5:15 pm
Division: C
State: VA
Location: in my room because I never leave it
Has thanked: 5 times
Been thanked: 0

### Re: Sounds of Music C

UTF-8 U+6211 U+662F wrote:
September 22nd, 2019, 6:40 am
What are the five main groups in the Hornbostel-Sachs system?
Idiophones, membranophones, aerophones, chordophones, and electrophones
TJHSST '22
2020 Events: Code, Machines, Sounds

gz839918
Member
Posts: 102
Joined: April 27th, 2019, 6:40 pm
Division: Grad
State: NC
Location: in the 317 or the 919 :)
Has thanked: 63 times
Been thanked: 19 times
Contact:

### Re: Sounds of Music C

Since smayya337 had the right answer but no posts have followed, I suppose it wouldn't hurt to start this up again.

Alice and Bob are playing a duet. Alice is supposed to play a note at 110.0 Hz and Bob is supposed to play a note at 164.8 Hz, but Bob accidentally plays his note 50 cents sharper than he is supposed to play it.

(a) What frequency does Bob actually play?
(b) If the interval between the notes is supposed to be a perfect fifth, Alice and Bob are playing most closely in what system of temperament? (A) Pythagorean (B) 12-tone equal (C) Just intonation (aka 5-prime) (D) All of these could be correct
I ❤ sounds of music! About meRate my tests
Physics and biology events

UNC-Chapel Hill ’23

Giantpants
Member
Posts: 141
Joined: February 7th, 2019, 5:42 am
Division: C
State: NY
Has thanked: 13 times
Been thanked: 17 times

### Re: Sounds of Music C

gz839918 wrote:
October 16th, 2019, 5:46 am
Alice and Bob are playing a duet. Alice is supposed to play a note at 110.0 Hz and Bob is supposed to play a note at 164.8 Hz, but Bob accidentally plays his note 50 cents sharper than he is supposed to play it.

(a) What frequency does Bob actually play?
(b) If the interval between the notes is supposed to be a perfect fifth, Alice and Bob are playing most closely in what system of temperament? (A) Pythagorean (B) 12-tone equal (C) Just intonation (aka 5-prime) (D) All of these could be correct
(a) 113.2 Hz
(b) I’m not so sure, but I think it might be D. all of the above, since the frequency ratio is always 3:2?
President, Kellenberg, 2018-2020
Bro. Joseph Fox, 2014-2017

2020 Events: Dynamic Planet, Geologic Mapping, Sounds of Music, Astronomy
Giantpants's Userpage

### Who is online

Users browsing this forum: No registered users and 3 guests