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Cambridge IGCSE Physics practice

Paper 4 structured question: Electromagnetic spectrum

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1

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Electromagnetic spectrum

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Paper 4Theory (Extended)1 marks

Understanding the differences between signal types is essential in electronics and communication.

Description

Signal Types

Digital signals are represented by discrete values, while analogue signals are represented by continuous values. Digital signals are less affected by noise and can be easily processed by computers.

  1. a

    State the main difference between digital and analogue signals.

    Aim for approximately 1 distinct marking point.

    [1]

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Paper 4 structured question: Electromagnetic spectrum

Paper 4Theory (Extended)2 marks

Description

Signal Characteristics

Digital signals are used in modern devices due to their reliability, while analogue signals are often found in older technology. Digital signals can be compressed and encrypted easily, enhancing data security.

  1. a

    State two advantages of using digital signals over analogue signals.

    Aim for approximately 2 distinct marking points.

    [2]