IB Physics/Digital Technology Option

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C.1 Analogue and digital signals[edit | edit source]

C.1.1 Solve problems involving the conversion between binary numbers and decimal numbers[edit | edit source]

C.1.2 Describe different means of storage of information in both analogue and digital forms[edit | edit source]

C.1.3 Explain how interference of light is used to recover information stored on a CD[edit | edit source]

C.1.4 Calculate an appropriate depth for a pit from the wavelength of the laser light[edit | edit source]

C.1.5 Solve problems on CDs and DVDs related to data storage capacity[edit | edit source]

C.1.6 Discuss advantage and disadvantage of the storage of information in digital rather than analogue form[edit | edit source]

C.1.7 Discuss the implications for society of ever-increasing capability of data storage[edit | edit source]

C.2 Data capture; digital imaging using charge-coupled devices (CCDs)[edit | edit source]

C.2.1 Define capacitance.[edit | edit source]

C.2.2 Describe the structure of a charge-coupled device (CCD).[edit | edit source]

C.2.3 Explain how incident light causes charge to build up within a pixel.[edit | edit source]

C.2.4 Outline how the image on a CCD is digitized.[edit | edit source]

C.2.5 Define quantum efficiency of a pixel.[edit | edit source]

Quantum efficiency is the ratio of the number of photoelectrons emitted to the number of photons incident on the pixel.

C.2.6 Define magnification.[edit | edit source]

C.2.7 State that two points on an object may be just resolved on a CCD if the images of the points are at least two pixels apart.[edit | edit source]

C.2.8 Discuss the effects of quantum efficiency, magnification and resolution on the quality of the processed image.[edit | edit source]

C.2.9 Describe a range of practical uses of a CCD, and list some advantages compared with the use of film.[edit | edit source]

C.2.10 Outline how the image stored in a CCD is retrieved.[edit | edit source]

C.2.11 Solve problems involving the use of CCDs.[edit | edit source]

C.3 Electronics[edit | edit source]

C.3.1 State the properties of an ideal operational amplifier (op-amp).[edit | edit source]

C.3.2 Draw circuit diagrams for both inverting and non-inverting amplifiers (with a single input) incorporating operational amplifiers.[edit | edit source]

C.3.3 Derive an expression for the gain of an inverting amplifier and for a non- inverting amplifier.[edit | edit source]

C.3.4 Describe the use of an operational amplifier circuit as a comparator.[edit | edit source]

C.3.5 Describe the use of a Schmitt trigger for the reshaping of digital pulses.[edit | edit source]

C.3.6 Solve problems involving circuits incorporating operational amplifiers.[edit | edit source]

C.4 The mobile phone system[edit | edit source]

C.4.1 State that any area is divided into a number of cells (each with its own base station) to which is allocated a range of frequencies.[edit | edit source]

Every area is divided into a number of cells (each with its own base station) to which is allocated a range of frequencies

C.4.2 Describe the role of the cellular exchange and the public switched telephone network (PSTN) in communications using mobile phones.[edit | edit source]

C.4.3 Discuss the use of mobile phones in multimedia communication.[edit | edit source]

• Vocal communication • Text communication (SMS, chatting etc.) • Communication through social networks on mobile phone (facebook, twitter etc.) • Communication can be one-to-one or one-to-many

Advantages: • Time efficient • Cost efficient • Best way to reach lots of people • Easy

Disadvantages: • No information is private • Lack of control of information • Less real life communication

C.4.4 Discuss the moral, ethical, economic, environmental and international issues arising from the use of mobile phones.[edit | edit source]

Moral / Ethical – Firstly, less human interaction in between adolescents as they are now able to lie at home and speak through their phones. Secondly, employees are distracted by their mobile phones when at their workplace. Economic- Not every one are able to afford mobile phones. International- It is now faster and simpler to communicate with people around the world. Environmental- Disposing of 15m phones each year just in the UK. Mobile phones contain cadmium, rhodium, palladium, beryllium and lead solder, which are all higly toxic.