part a: On the equally tempered scale, there are 12 notes or steps, each differe
ID: 1616321 • Letter: P
Question
part a:
On the equally tempered scale, there are 12 notes or steps, each different by a factor of 21/12 . After these notes the next one is 2 times the frequency of the one you start with, and this "octave" repeats the pattern again and again. An interval called a "perfect" Fifth has two notes on the ratio of frequencies of 3 to 2. On the equally tempered scale, how many steps are in a Fifth if the starting note is A and the "Fifth" is E? What is the actual ratio of frequencies?
7 notes and the ratio is (21/12)7 = 1.498
5 and the ratio is 1.5 exactly
7 and the ratio is 1.5 exactly
5 and the ratio is (21/12)7 = 1.498
Part b:
A common occurrence is to hear the siren of an approaching emergency vehicle and the change in its pitch (frequency) when the vehicle passes and moves away. If it is traveling at 80 km/hr and the speed of sound in cool dry air is 331 m/s, what frequency will we hear from the approaching vehicle if it emits 1200 Hz when at rest?
1200 Hz
1490 Hz
1119 Hz
1281 Hz
Part c:
See if you can associate the scientist with their contributions
Isaac Newton
Albert Einstein
Lord Kelvin
Robert Hooke
Archimedes
Entropy
Bouyancy
Classical Laws of Motion and Gravity
Special and General Relativity
Elastic behavior of materials
1200 Hz
1490 Hz
1119 Hz
1281 Hz
Part c:
See if you can associate the scientist with their contributions
Isaac Newton
Albert Einstein
Lord Kelvin
Robert Hooke
Archimedes
A.Entropy
B.Bouyancy
C.Classical Laws of Motion and Gravity
D.Special and General Relativity
E.Elastic behavior of materials
Explanation / Answer
Part B:
f = 1200 Hz, v = 331 m/s
vo = 80 km/hr = 22.22 m/s
from Doppler effect fo =f *(v+vo)/(v-vs)
fo = 1200*(331+22.222)/(331-0)
fo = 1281 Hz
Part c:
Issac newton (C)
ALber Einstein (D)
Lord Kelvin (A)
Robert Hooke (E)
Archimedes (B)
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