The middle note C has a frequency of 262 hertz and can be modeled using a sine function with an amplitude of 1.5, where x is time in seconds. Which function represents the vibrations of this note?

Respuesta :

Answer:  f(x) = 1.5*sin(x*2*pi/0.0038s)

Step-by-step explanation:

A sine function is:

f(x) = A*sin(c*x + f)

Where A is the amplitude, we know that it is 1.5

c is a constant that depends on the frequency.

f is a phase.

As there is no mention of a phase, we can assume f = 0.

Then our function is:

f(x) = 1.5*sin(c*x)

now let's find the value of c.

We know that the frequency is 262hz.

Then the period can be calculated with the equation:

T = 1/f.

T = 1/262 Hz = 0.0038 seconds.

Now, the period of a sin function is 2*pi.

whit pi = 3.14159265358979.....

Then we have that:

sin(0) = sin(c*0.0038s)

sin(0) = sin(2*pi)

then:

c*0.0038s = 2*pi

c = 2*pi/0.0038s

Then the function is:

f(x) = 1.5*sin(x* 2*pi/0.0038s)

According to the information given, the sine function is:

[tex]y = 1.5\sin{(524\pi x)}[/tex]

The standard sine function is given by:

[tex]y = A\sin{(2\pi fx)}[/tex]

In which:

  • A is the amplitude.
  • f is the frequency, in Hz.

In this problem:

  • Amplitude of 1.5, hence [tex]A = 1.5[/tex]
  • Frequency of 262 Hz, hence [tex]f = 262[/tex]

Then, the equation is:

[tex]y = A\sin{(2\pi fx)}[/tex]

[tex]y = 1.5\sin{(2\pi (262)x)}[/tex]

[tex]y = 1.5\sin{(524\pi x)}[/tex]

A similar problem, which also involves building a sine function according to the desired characteristics, is given at https://brainly.com/question/18055768