Theory

CH16 - COMMUNICATION

(a) State what is meant by the \textit{amplitude modulation (AM)} of a radio wave........................................................................

2021 Summer

3

Theory

CH16 - COMMUNICATION

(a) State two advantages of converting the signal into digital form for transmission.1. .................................................................

2021 Winter

3

Theory

CH16 - COMMUNICATION

(a) A sinusoidal carrier wave has a constant amplitude and a frequency of 1.2 MHz. The carrier wave is modulated by a signal wave such that a 1.0 V di...

2021 Summer

2

Theory

CH16 - COMMUNICATION

(a) (i) When audio signals are transmitted over long distances, modulation of radio waves is used.Suggest a reason why modulation is used...............

2021 Winter

3

Theory

CH16 - COMMUNICATION

(a) State what is meant by the amplitude modulation (AM) of a radio wave.................................................................................

2021 Summer

3

Theory

CH16 - COMMUNICATION

An analogue signal is to be transmitted to a receiver. Before transmission, the signal passes through an analogue-to-digital converter (ADC). After tr...

2021 Winter

3

Theory

CH16 - COMMUNICATION

(a) (i) By reference to an ultrasound wave, explain what is meant by specific acoustic impedance.........................................................

2020 Summer

4

Theory

CH16 - COMMUNICATION

(a) The transmission of signals using optic fibres has, to a great extent, replaced the use of coaxial cables.Advantages of optic fibres include great...

2020 Summer

4

Theory

CH16 - COMMUNICATION

(a) (i) By reference to an ultrasound wave, explain what is meant by specific acoustic impedance.........................................................

2020 Summer

4

Theory

CH16 - COMMUNICATION

(a) Explain the principles of the \textbf{generation} of ultrasound waves for use in medical diagnosis...................................................

2020 Winter

4

Theory

CH1 - PHYSICAL QUANTITIES & UNITS

(a) State what is meant by a $\text{scalar}$ quantity and by a $\text{vector}$ quantity. [2] (b) Complete Fig. 1.1 to indicate whether each of t...

2018 Summer

2

Theory

CH3 - KINEMATICS

(a) State what is meant by the mass of a body. [1] (b) Two blocks travel directly towards each other along a horizontal, frictionless surface. T...

2018 Summer

3

Theory

CH14 - WAVES

(a) For a progressive wave, state what is meant by (i) the period,   [1] (ii) the wavelength.   [1] (b) Fig. 4.1 shows the vari...

2018 Summer

2

Theory

CH14 - WAVES

(a) When monochromatic light is incident normally on a diffraction grating, the emergent light waves have been diffracted and are coherent. Explain w...

2018 Summer

2

Theory

CH19 - CURRENT OF ELECTRICITY

(a) Define the volt............................................................................................................... [1](b) A battery of...

2018 Summer

2

Theory

CH17 - ELECTRIC FIELDS

A $\beta^{-}$ particle from a radioactive source is travelling in a vacuum with kinetic energy 460 eV. The particle enters a uniform electric field at...

2018 Summer

3

Theory

CH1 - PHYSICAL QUANTITIES & UNITS

(a) Define force. .....................................................................................................................[1] (b) State...

2018 Summer

3

Theory

CH3 - KINEMATICS

(a) State the principle of conservation of momentum. [2] (b) A stationary firework explodes into three different fragments that move in a horizontal ...

2018 Summer

3

Theory

CH3 - KINEMATICS

A child on a sledge slides down a steep hill and then travels in a straight line up an ice-covered slope, as illustrated in Fig. 3.1. The sledge pa...

2018 Summer

3

Theory

CH14 - WAVES

(a) (i) Define the wavelength of a progressive wave.   [1] (ii) State what is meant by an antinode of a stationary wave.   [1] (...

2018 Summer

3