Test Index

JAMB Physics 2021 Paper

Question : 35

Total: 40

Solution:

Concept:

Overtones are higher harmonics of the fundamental frequency of a stretched string.

Explanation:

Fundamental frequency:

f_0 = 40\text{Hz}

Overtones are whole-number multiples of

f_0

1st overtone:

2f_0 = 80\text{Hz}

2nd overtone:

3f_0 = 120\text{Hz}

3rd overtone:

4f_0 = 160\text{Hz}

4th overtone:

5f_0 = 200\text{Hz}

(too high)

The frequencies between

40\text{Hz}

and

180\text{Hz}

are

80\text{Hz}

120\text{Hz}

, and

160\text{Hz}

Therefore, there are 3 overtones.

Answer:

B. 3

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