smc-3728-30-Historical development

ENGINEERING, TE 2025 HSC 21d

Discuss the effect of ONE telecommunications engineering innovation on people's lives. (4 marks)

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[P] Mobile phone technology has significantly transformed how people communicate and access information daily.
[E] Smartphones enable instant communication, remote working and access to banking, healthcare and education from anywhere.
[Ev] During the COVID-19 pandemic, mobile phones allowed millions to work and study from home, maintaining productivity.
[L] On one hand, mobile phones have improved quality of life by keeping people connected and informed at all times.
[P] However, mobile phone technology also presents significant challenges for individuals and society.
[E] Constant connectivity has contributed to rising rates of anxiety, sleep disruption and reduced face-to-face interaction.
[Ev] Studies show excessive screen time is linked to poorer mental health outcomes, particularly in young people.
[L] Despite these benefits, the negative impact on mental health and social connection must be carefully considered.

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[P] Mobile phone technology has significantly transformed how people communicate and access information daily.
[E] Smartphones enable instant communication, remote working and access to banking, healthcare and education from anywhere.
[Ev] During the COVID-19 pandemic, mobile phones allowed millions to work and study from home, maintaining productivity.
[L] On one hand, mobile phones have improved quality of life by keeping people connected and informed at all times.
[P] However, mobile phone technology also presents significant challenges for individuals and society.
[E] Constant connectivity has contributed to rising rates of anxiety, sleep disruption and reduced face-to-face interaction.
[Ev] Studies show excessive screen time is linked to poorer mental health outcomes, particularly in young people.
[L] Despite these benefits, the negative impact on mental health and social connection must be carefully considered.

The screens of black and white cathode ray tube televisions were coated with a material that produced light when struck by electrons.

What was the material?

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\(B\)

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In a cathode ray tube (CRT), an electron gun fires a beam of electrons at high speed toward the screen.
The inner surface of the screen is coated with phosphor, a material that exhibits photoluminescence — it absorbs energy from the electron beam and re-emits it as visible light.
Plasma is a display technology distinct from CRT; lead oxide was used in the glass of the CRT envelope to absorb X-rays, not to produce light; magnesium oxide is not used in CRT screens.

\(\Rightarrow B\)

♦♦ Mean mark 45%.

Outline ways in which satellite services have benefited people living and working in rural areas. (2 marks)

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Satellite technology enables communication in remote regions beyond traditional cellular coverage.
Because satellites operate independently of ground-based infrastructure, they can deliver services across vast territories without the distance limitations of cellular networks.

Three examples of communication devices are shown.

How has each of these devices contributed to the advancement of telecommunications? (3 marks)

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Morse Code key

Telephone

Smartphone

Multi-function device with a diverse range of applications, including internet access, voice recording and photography.

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Morse Code key

Telephone

Smartphone

Multi-function device with a diverse range of applications, including internet access, voice recording and photography.