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8.1 Continuum spectra

Activity 4: General properties of quasars and power-law emission

0 hours 30 minutes

10.1 Introduction

For a variety of reasons, not least the very wide dynamic range of human hearing, the decibel (symbol dB) is often used as a unit for the amplitude of sound waves. The decibel is also used in other contexts, such as specifying the amplification of amplifiers or the degree to which a signal is affected by noise. In the context of sound, the use of the decibel as a unit captures something of the subjective impression of the way loudness changes with amplitude.

The decibel unit has
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8 Further resources

There is a wide range of material available on welfare to work. Peck (2001) is undoubtedly the definitive study in terms of policy development in the UK and the USA.

Major sources of data on all UK New Deal programmes are on the Department for Work and Pensions, DWPwebsite. (Accessed 25 March 2008)

Another source is the more analytical Working Brief series which
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LR - Be Organized
"Discover the most efficient method for downloading images into Lightroom and organizing them. Quickly import and manage your photo collection in a library that makes organizing, finding and editing your photos easy. "
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Keep on learning

Study another free course

There are more than 800 courses on OpenLearn for you to choose from on a range of subjects. 

Find out more
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Does the Advance of Science Mean Secularisation? - Discussion
Prof. David Martin : Discussion
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Learning outcomes

After studying this course, you should be able to:

  • demonstrate an awareness of the roles and responsibilities of the modern scientist

  • demonstrate an insight as a scientist into the social and ethical aspects of scientific research

  • understand the rationale and role of certain contemporary tools for science governance, especially public and stakeholder engagement/consultation

  • recognise opportunities to contribute to discussion and debat
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2.1 The importance of sine waves

For much of the rest of this unit we shall be concerned with the properties of a type of sound wave that when represented as a graph has a characteristic shape known as a sine wave. Figure 1 shows you what a sine-wave graph looks like. For the moment you need not be concerned with what this grap
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TALAT Lecture 2101.01: Understanding aluminium as a material
This lecture is an introduction to aluminium alloys, fabrication methods and properties. It provides information about the classification of aluminium alloys, new alloys and composites; shaping processes, processing chains and component shapes; microstructure and the interaction between microstructure and properties. It promotes understanding of the fact that the correct choice of materials demands knowledge of alloys, shaping processes and microstructure and the interaction among them. The lect
Author(s): TALAT,Sigurd Støren, The Norwegian Institute of T

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http://creativecommons.org/licenses/by-nc-sa/2.0/uk/

5.6 Casting defects

The first class of defect would have been inferred from examination of fractures in the cast-iron columns, where, for example, the wall thickness would be exposed for measurement. However, some of the casting defects he mentioned in his testimony – and which were to gain some notoriety both in the popular press accounts of the enquiry and in later accounts – are difficult to describe in detail because he did not specify where they were found in the debris, or how exactly they had contribu
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3.2.1 Remarks

  1. By ‘contains’, we mean that we can find part of the surface that is homeomorphic to a Möbius band. The edge of the Möbius band does not need to correspond to an edge at the surface, so that a surface without boundary can be non-orientable (as we shall shortly see).

  2. When seeking Möbius bands in a surface, it can be helpful to look at all possible closed curves on the surface and thicken these into bands.

  3. Remember, fro
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    Except for third party materials and/or otherwise stated (see terms and conditions) the content in OpenLearn is released for use under the terms of the Creative Commons Attribution-NonCommercial-Share

5.1 The linear model of communications

One of the key tasks of social marketers is to develop effective messages which provide individuals and organisations with the information required to achieve behavioural change. Communication represents the ‘transmission of information, ideas, attitudes, or emotion from one person or group to another’ (Fill, 2002, p. 31). There are many models and frameworks available to help with communications planning. First, an understanding of how communication works is illustrated in Author(s): The Open University

4.5 M is for Method

Method is about the way in which a piece of information is produced. This is quite a complex area as different types of information are produced in different ways. These are a few suggestions to look out for:

Opinions - A lot of information is based on the opinion of individuals. They may or not be experts in their field (see P for Provenance) but the key message is to be clear that it is just an opinion and must be valued as such.

Research - You don't have to be an
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1.2.5 Bar charts: Surgical removal of tattoos

Figure 4 shows a bar chart for the data in Table 7 on the effectiveness
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5.1 Overview

The enquiry team set up by the Board of Trade, and sitting in Dundee Court House, held an initial session lasting several days starting on Saturday 3 January 1880. There were three members chaired by Mr Rothery, Commissioner of Wrecks. The others were Colonel Yolland, the Inspector of Railways, and Mr W H Barlow, president of the Institute of Civil Engineers, and a distinguished practising civil engineer.

Henry Rothery was a mathematics graduate but trained as a barrister. He had been a
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The History of the United Nations
A quick run through of the birth of the UN and some of the major events in its history. The narrator speaks quickly making it a little hard to follow.
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Conclusion

This free course provided an introduction to studying Science. It took you through a series of exercises designed to develop your approach to study and learning at a distance and helped to improve your confidence as an independent learner.


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1.1 What happens during an earthquake?

The Earth is an active planet, with activity occurring in the oceans, in the atmosphere and in the solid Earth itself. This course looks at a dramatic example of solid Earth activity: earthquakes.

You probably have some idea from newspapers, television or perhaps personal experience, of just how powerful earthquakes can be. In a matter of minutes earthquakes have devastated cities and killed a quarter of a million people. I was in only a medium-sized earthquake in 1978, but even that ha
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6.1 Concentrating energy

As far as human needs are concerned, there is a marked difference between 'dilute' and 'concentrated' energy. Water vapour in the atmosphere, for example, has considerable Author(s): The Open University

1 What's in a title? An introduction

Because the words ‘care’, ‘welfare’ and ‘community’ are so much a part of everyday language and debate, there's perhaps an assumption that people agree about what they each mean. These are three words that mostly evoke warm and positive feelings. In Activity 1 you're asked to think about opposite points of view.

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