Question

Select all that apply.

a column of air in a tube is vibrating at its fundamental frequency of 150Hz. Which of the following frequencies could also exist in the tube as harmonics?
- 75 Hz
- 225 Hz
- 300 Hz
- 450 Hz

Answer 1

300 and 450

Step-by-step explanation:

Answer 2

-300 Hz

-450 Hz

Step-by-step explanation:

As we know that frequency of nth harmonic mode is known as

`f_n = (nv)/(2L)`

now we know that for fundamental mode of frequency we will have

n = 1

`f_o = (v)/(2L)`

so we will have

`f_n = n f_o`

now given that

`f_o = 150 Hz`

and also we have

n = integer

so we will have

n = 2

`f = 300 Hz`

n = 3

`f = 450 Hz`