Vibrations pitch frequency worksheet - Free Printable

Let's solve this step-by-step.

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Part 1: Fill in the blanks

We are given a word box:
> amplitude, frequency, Hertz, height, high, lower, louder, microphone, vibrates, vibrations, waves

Now let’s go through each sentence and fill in the correct word(s).

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1. All musical instruments make a sound because something _________.
→ vibrates
*Explanation:* Sound is produced by vibrations.

2. Instruments like violins produce a _________ pitched sound. This means that the strings are vibrating at a high _________.
→ high, frequency
*Explanation:* High-pitched sounds come from high-frequency vibrations.

3. An oscilloscope can show a sound wave on a screen when it is connected to a _________.
→ microphone
*Explanation:* A microphone converts sound waves into electrical signals that an oscilloscope can display.

4. When the waves on the screen are very close together they show that the sound waves have a high _________. Waves which are far apart show sound waves with a _________ frequency.
→ frequency, lower
*Explanation:* Closely spaced waves = high frequency; widely spaced waves = low frequency.

5. The frequency of a sound wave is the number of _________ that pass a point every second.
→ waves
*Explanation:* Frequency = number of wave cycles per second.

6. The loudness of a sound is shown by the _________ of the waves. Half the height of a wave is called the _________. The bigger the amplitude of the wave the _________ the sound.
→ height, amplitude, louder
*Explanation:* Amplitude determines loudness. Height of the wave is related to amplitude; larger amplitude → louder sound.

7. The unit for frequency is the _________ (Hz). A frequency of 50 Hz means that 50 _________ pass every second.
→ Hertz, waves
*Explanation:* Hertz (Hz) is the unit of frequency. 50 Hz = 50 wave cycles per second.

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✔ Completed Part 1:

All musical instruments make a sound because something vibrates.
Instruments like violins produce a high pitched sound. This means that the strings are vibrating at a high frequency.
An oscilloscope can show a sound wave on a screen when it is connected to a microphone. When the waves on the screen are very close together they show that the sound waves have a high frequency. Waves which are far apart show sound waves with a lower frequency.
The frequency of a sound wave is the number of waves that pass a point every second. The loudness of a sound is shown by the height of the waves. Half the height of a wave is called the amplitude. The bigger the amplitude of the wave the louder the sound.
The unit for frequency is the Hertz (Hz). A frequency of 50 Hz means that 50 waves pass every second.

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Part 2: Analyze the Oscilloscope Images (A–E)

We are given five oscilloscope traces:

- A: One large wave, moderate amplitude, low frequency
- B: Very tall wave, high amplitude, moderate frequency
- C: Many small waves, low amplitude, high frequency
- D: Medium amplitude, medium frequency
- E: Medium amplitude, slightly higher than D but less than B, lower frequency than C

Let’s answer each question.

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#### a) Which two sounds have the same loudness or volume?

Loudness depends on amplitude (height of the wave).

- Compare amplitudes:
- A: moderate
- B: very high
- C: low
- D: medium
- E: medium (similar to D)

So, D and E have similar amplitudes → same loudness.

✔ Answer: D and E

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#### b) Which sound wave has the highest frequency?

Frequency = how many waves fit in a given time (how close together the peaks are).

- C has the most waves in the same space → highest frequency.

✔ Answer: C

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#### c) Which sound wave has the lowest frequency?

Lowest frequency = fewest waves in the same time.

- A has only one full wave → lowest frequency.

✔ Answer: A

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#### d) Which sound wave has the lowest pitch?

Pitch is determined by frequency — lower frequency = lower pitch.

From part (c), A has the lowest frequency → lowest pitch.

✔ Answer: A

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#### e) Which sound wave is twice as loud as the sound in D?

Loudness ∝ amplitude.

- D has medium amplitude.
- B has much higher amplitude — about twice the height of D.
- So, B is twice as loud.

Note: "Twice as loud" is subjective, but in terms of amplitude, if amplitude doubles, loudness increases significantly (though not exactly twice due to logarithmic perception). But here, we're comparing visually.

B clearly has double the amplitude of D.

✔ Answer: B

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✔ Final Answers:

Part 1:
- vibrates
- high, frequency
- microphone
- frequency, lower
- waves
- height, amplitude, louder
- Hertz, waves

Part 2:
a) D and E
b) C
c) A
d) A
e) B

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