Sounds of Music C

User avatar
windu34
Moderator
Moderator
Posts: 1327
Joined: April 19th, 2015, 6:37 pm
Division: Grad
State: FL
Location: Gainesville, Florida

Re: Sounds of Music C

Postby windu34 » November 6th, 2018, 1:30 pm

I was wondering, can I use blanks? They are reeds that are not fully shaved so I have to work on them still. They just make it easier than buying normal cane and having to cut it.
I think this is going to be a question best answered by submitting an FAQ to Soinc.org.
Link
Boca Raton Community High School Alumni
Florida State Tournament Director 2020
National Physical Sciences Rules Committee Member
kevin@floridascienceolympiad.org || windu34's Userpage

Event Supervisor for 2020:
UT Austin - Circuit Lab B/C
Solon - Circuit Lab C
Nationals - Circuit Lab C

hippo9
Member
Member
Posts: 247
Joined: March 12th, 2018, 9:35 am
Division: C
State: IN

Re: Sounds of Music C

Postby hippo9 » November 10th, 2018, 11:11 pm

I know a one octave major scale must be played, but this mean 8 notes (restarting the sequence) or just the regular 7? I ask because the pitch scores would add up to 36 if 8 notes were required, but major scales only have 7 notes.
"If we knew what we were doing, it wouldn’t be called research." - Albert Einstein

2018: Battery Buggy, Road Scholar, Roller Coaster
2019: Chemistry Lab, Codebusters, Disease Detectives, Fossils, Geologic Mapping, Sounds of Music

mjcox2000
Member
Member
Posts: 120
Joined: May 9th, 2014, 3:34 am
Division: Grad
State: VA

Re: Sounds of Music C

Postby mjcox2000 » November 11th, 2018, 6:15 am

I know a one octave major scale must be played, but this mean 8 notes (restarting the sequence) or just the regular 7? I ask because the pitch scores would add up to 36 if 8 notes were required, but major scales only have 7 notes.
A major scale consists of 8 notes, not 7 — it contains the tonic in two different octaves.
MIT ‘23
TJHSST ‘19
Longfellow MS
2019:
Circuit Lab: 1st
Thermodynamics: 2nd
Sounds of Music: 5th
Mission Possible: 6th

2018:
Code Busters (trial): 1st

2015:
Simple Machines: 2nd
SumoBots (trial): 2nd

2014:
WIDI: 2nd
Simple Machines: 3rd

hippo9
Member
Member
Posts: 247
Joined: March 12th, 2018, 9:35 am
Division: C
State: IN

Re: Sounds of Music C

Postby hippo9 » November 11th, 2018, 7:23 am

I know a one octave major scale must be played, but this mean 8 notes (restarting the sequence) or just the regular 7? I ask because the pitch scores would add up to 36 if 8 notes were required, but major scales only have 7 notes.
A major scale consists of 8 notes, not 7 — it contains the tonic in two different octaves.
Ok thanks! I was just making sure because the scales only have 7 distinct notes.
"If we knew what we were doing, it wouldn’t be called research." - Albert Einstein

2018: Battery Buggy, Road Scholar, Roller Coaster
2019: Chemistry Lab, Codebusters, Disease Detectives, Fossils, Geologic Mapping, Sounds of Music

User avatar
SciolyHarsh
Member
Member
Posts: 37
Joined: May 20th, 2018, 5:44 pm
State: -

Re: Sounds of Music C

Postby SciolyHarsh » November 13th, 2018, 7:16 pm

Haven't been able to find out how to reach the correct answer for this question. So, the first question is:

At a party, there is a louder stereo blaring some dank music. I'm a party animal so I'm standing 1 meter away from the stereo and I perceive a sound intensity of 10^-1 , what is the approximate decibel level that I perceive to the nearest tenth?

So I got 110 dB for this, from doing I(dB)=10log(I/I*). I'm not able to get a correct answer for part 2, which is:

You are more far away, 20 meters, because you are a normal person, what is the sound intensity you perceive and the approximate decibel level?

My answer for the sound intensity is 1/4000 and 83.979 dB for the decibel level. The answer key says it's 0.00025 dB and 10^-3 .

How would you get the correct answers for part 2?
2017-2018 Events: Chemistry Lab, Dynamic Planet, Microbe Mission, Experimental Design, Rocks and Minerals

2018-2019 Events: Dynamic Planet, Astronomy, Sounds of Music, Circuit Lab, Geologic Mapping

UTF-8 U+6211 U+662F
Exalted Member
Exalted Member
Posts: 1518
Joined: January 18th, 2015, 7:42 am
Division: C
State: PA

Re: Sounds of Music C

Postby UTF-8 U+6211 U+662F » November 13th, 2018, 7:20 pm

Haven't been able to find out how to reach the correct answer for this question. So, the first question is:

At a party, there is a louder stereo blaring some dank music. I'm a party animal so I'm standing 1 meter away from the stereo and I perceive a sound intensity of 10^-1 , what is the approximate decibel level that I perceive to the nearest tenth?

So I got 110 dB for this, from doing I(dB)=10log(I/I*). I'm not able to get a correct answer for part 2, which is:

You are more far away, 20 meters, because you are a normal person, what is the sound intensity you perceive and the approximate decibel level?

My answer for the sound intensity is 1/4000 and 83.979 dB for the decibel level. The answer key says it's 0.00025 dB and 10^-3 .

How would you get the correct answers for part 2?
You are correct. Ignore the answer key.

User avatar
SciolyHarsh
Member
Member
Posts: 37
Joined: May 20th, 2018, 5:44 pm
State: -

Re: Sounds of Music C

Postby SciolyHarsh » November 13th, 2018, 7:58 pm

Haven't been able to find out how to reach the correct answer for this question. So, the first question is:

At a party, there is a louder stereo blaring some dank music. I'm a party animal so I'm standing 1 meter away from the stereo and I perceive a sound intensity of 10^-1 , what is the approximate decibel level that I perceive to the nearest tenth?

So I got 110 dB for this, from doing I(dB)=10log(I/I*). I'm not able to get a correct answer for part 2, which is:

You are more far away, 20 meters, because you are a normal person, what is the sound intensity you perceive and the approximate decibel level?

My answer for the sound intensity is 1/4000 and 83.979 dB for the decibel level. The answer key says it's 0.00025 dB and 10^-3 .

How would you get the correct answers for part 2?
You are correct. Ignore the answer key.
Thank you! I spent so much time stressing over a wrong key!
2017-2018 Events: Chemistry Lab, Dynamic Planet, Microbe Mission, Experimental Design, Rocks and Minerals

2018-2019 Events: Dynamic Planet, Astronomy, Sounds of Music, Circuit Lab, Geologic Mapping

User avatar
SciolyHarsh
Member
Member
Posts: 37
Joined: May 20th, 2018, 5:44 pm
State: -

Re: Sounds of Music C

Postby SciolyHarsh » November 15th, 2018, 6:40 pm

One more question!

This one also has two parts.

A nylon string on a violin has a density of 1200 kg/m^3 with a diameter of 4x10^-3 meters. The string is held with a tension of 220 N and the frequency of the first harmonic of the G string is 196 Hz. What is the length of the string?


So I solved this and got 0.308 m, which is correct, but I don't know how to solve the next part.

If we wanted to play one octave up on the open string from the fundamental G in question 12, how much do we need to increase the tension?
2017-2018 Events: Chemistry Lab, Dynamic Planet, Microbe Mission, Experimental Design, Rocks and Minerals

2018-2019 Events: Dynamic Planet, Astronomy, Sounds of Music, Circuit Lab, Geologic Mapping

User avatar
TheSquaad
Member
Member
Posts: 159
Joined: March 18th, 2017, 5:14 pm
Division: Grad
State: -
Location: Somewhere over the rainbow

Re: Sounds of Music C

Postby TheSquaad » November 16th, 2018, 4:35 am

One more question!

This one also has two parts.

A nylon string on a violin has a density of 1200 kg/m^3 with a diameter of 4x10^-3 meters. The string is held with a tension of 220 N and the frequency of the first harmonic of the G string is 196 Hz. What is the length of the string?


So I solved this and got 0.308 m, which is correct, but I don't know how to solve the next part.

If we wanted to play one octave up on the open string from the fundamental G in question 12, how much do we need to increase the tension?
You double the frequency to go up an octave. Because tension is square routed, it needs to multiply by a factor of 4 to increase frequency by a factor of 2

CaTaStRoPhY
Member
Member
Posts: 11
Joined: January 14th, 2018, 8:10 am
Division: C
State: NY

Re: Sounds of Music C

Postby CaTaStRoPhY » November 25th, 2018, 1:43 pm

The rule manual mentions "Basic terminology regarding sound, sound production, and related science terms". What does this mean, specifically? Anyone have resources for this section?
2018 events: Ecology, Microbe Mission, Thermodynamics, Herpetology
2019 events: Thermodynamics, Mousetrap Vehicle, Sounds of Music


Return to “2019 Lab Events”

Who is online

Users browsing this forum: No registered users and 1 guest