C
CraftExam
medium difficulty5 min

Loudness and Pitch

Loudness depends mainly on amplitude of vibration, while pitch depends mainly on frequency of vibration.

In one line: Amplitude for amount of sound; frequency for fineness of note.

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Understand it

A sound with larger amplitude carries more energy and is heard as louder. A sound with higher frequency is heard as shriller or higher-pitched. Loudness and pitch are different qualities, so a sound can be loud but low-pitched, or soft but high-pitched.

Example

A drum beaten harder sounds louder because its membrane vibrates with greater amplitude, while a whistle sounds high-pitched because it has high frequency.

Rule to remember

Loudness is related to amplitude and energy; pitch is related to frequency.

Higher amplitude means louder sound, higher frequency means higher pitch.

See it worked out

Follow the example line by line, then use the same method on new questions.

Worked example

  1. 1Two sounds have the same frequency, but one has greater amplitude.
  2. 2The greater-amplitude sound is louder, while pitch remains the same because frequency has not changed.

Method you can reuse

  1. 1Read what changes in the situation.
  2. 2If vibration size changes, discuss loudness.
  3. 3If vibrations per second change, discuss pitch.
  4. 4Match the conclusion with amplitude or frequency.

Visual tip

A comparison sketch can show high and low amplitude waves for loudness, and high and low frequency waves for pitch.

Check yourself

Answer the question in your head before opening the answer.

Try it yourself

A flute note becomes sharper but not necessarily louder. Which wave characteristic has mainly increased?

Think first, then show answer
The frequency has mainly increased because sharper or higher-pitched sound depends on frequency, not necessarily on amplitude.

Common wrong answer

A louder sound must have greater frequency.

Why it loses marks: Loudness mainly depends on amplitude.

Don't mix this up

Students often write that a louder sound always has higher pitch. Loudness and pitch depend on different wave characteristics.

Exam tip

For loudness mention amplitude; for pitch mention frequency. Do not interchange them in one-mark answers.

Write it in the exam

Each point is worth about one mark. Write point 1 for a 1-mark question and keep adding points as the marks go up.

How CBSE asks it

Questions commonly ask students to distinguish loudness and pitch using examples like drum, whistle, mosquito sound, or human voice.
  1. 1

    Enough for 1 mark

    Loudness depends mainly on amplitude of vibration, while pitch depends mainly on frequency of vibration.

  2. 2

    Add for 2 marks

    Example: A drum beaten harder sounds louder because its membrane vibrates with greater amplitude, while a whistle sounds high-pitched because it has high frequency.

  3. 3

    Add for 3 marks

    A sound with larger amplitude carries more energy and is heard as louder.

Practice

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