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5.6 Vibrating air column

You learned in the previous section that for standing waves to be set up on a string there must be reflection. A travelling wave reaches the end of the string and is reflected. This results in a second travelling wave, which moves back up the string in the opposite direction to the first wave. The two travelling waves interact to produce a standing wave.

Standing waves are set up in an air column enclosed within a tube in a very similar way. Again there must be reflection. In this case,
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How to Write a Book or Story
Tips from a published author and English professor in this video on writing. Compose a book, whether as a form of expression or a form of financial stability, with help from this video.
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Chem 51C (Spring 2012): Reactions of Organometallic Reagents with Carbonyl Compounds and Carboxylic
Spring Quarter 2012, Lecture 3 for Chem 51C: Organic Chemistry recorded on Tuesday, April 10. Items covered: Ch. 20. Reactions of Organometallic Reagents with Carbonyl Compounds. Reactions of Members of the Carboxylic Acid Family with Hydride Nucleophiles and Organometallic Reagents.
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2.2 Population screening for genetic disease: the precedents

Knowing about particular genes, or their effects, also permits screening – the search in a population for persons with certain genotypes that are associated with a particular disease. Thus the test may be offered to one and all. Until now, screening programmes have focused on one gene at a time, or one disease at a time, in cases where a mutated gene poses serious health problems and something can be done for those who are found to carry the mutation. What that something is varies with the
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Lego Hat Stealers
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Learning outcomes

After studying this course, you should be able to:

  • understand why systems thinking might be useful and know something about how it can be applied in the context of environmental responsibility

  • describe the significance of environmental pragmatism and cognitive justice as tools for supporting environmental policy and action.


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1.7 Summary of Section 1 and questions

  • Converging lenses or mirrors cause parallel beams of light to be brought to a focus at the focal point, situated at a distance of one focal length beyond the lens or one focal length in front of the mirror. Diverging lenses or mirrors cause parallel beams of light to diverge as if emanating from the focal point of the lens or mirror. Light paths are reversible, so a converging lens or mirror may also act as a collimator and
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Examples 3 and 4

Example 3

Example 3Author(s): The Open University

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3.3.1 Try some yourself

Activity 27

  • (a) Divide a £27 000 jackpot prize equally among 9 people in the syndicate.

  • (b) Divide a £27 000 jackpot prize equally among 900 people in the syndi
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Making local adjustments in Camera Raw
Apply color and tonal adjustments to areas of a photo, like traditional dodging and burning, with the Adjustment Brush and Graduated Filter.
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Learning outcomes

After studying this course, you should be able to:

  • work with simple ratios

  • convert between fractions, decimals and percentages

  • explain the meaning of ratio, proportion and percentage

  • find percentages of different quantities

  • calculate percentage increases and decreases.


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4.1 Introduction

The 1970s marked a period in which the cessation of the ‘normal’ period of full-time employment at 60 or 65 years had become the accepted orthodoxy. The personal lives of older people had thus become constituted outside the domain of paid employment and within the arena of public and private welfare. As we illustrated in the preceding section, pensions, organised around fixed ages of retirement based on chronological measurements of age, played a crucial role in this process. Further, as
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Introduction

This course helps you to explore the extent to which death and dying in western societies are medical events and what aspects of death and dying might be neglected as a consequence. The course covers the way that such things as medicine provide the context of the experiences associated with the end of life.

This OpenLearn course is an adapted extract from the Open University course : Author(s): The Open University

Must-Know Japanese Social Media Phrases #5 - At a Concert
Learn Japanese with JapanesePod101.com! Have you ever wanted to combine your love of learning language with your love of using social media? This series allows you to do just that! You’ll learn more Japanese so you can chat to your Japanese friends online about topics like shopping, going out to dinner, and being on vacation. [...]
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6 Phylogeny and cladistic analysis

In Section 3.3 the point was made that many physiologists consider that desert birds are successful because of their avian physiology, not because of any specific adaptations. While Williams and Tieleman's research on hoopoe larks demonstrated that desert species are capable of flexibility in metabolic rate and evaporative water loss, it suggested that adaptation is important too. The selective advantages of lowered BMR and TEWL for desert birds include reduced energy demand, and lower produc
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3.1 Introduction

The main role of glucose within the body is as a fuel but it also contributes to the fabric (tissue) by attaching to proteins. In people without diabetes, the blood glucose levels are kept within very narrow limits. The body does not allow them to become too high or too low. Several parts of the body are involved in this process. Some are large, for example the liver, and some are very small, such as the cells within the pancreas. Cells are small building blocks of the body and cannot
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Mysterious Ball Lightning
This video shows many different incidents of ball lightning. Ball lightning may be an atmospheric electrical phenomenon, the physical nature of which is still controversial. The term refers to reports of luminous, usually spherical objects which vary from pea-sized to several meters in diameter. It is sometimes associated with thunderstorms, but unlike lightning flashes, which last only a fraction of a second, ball lightning reportedly lasts many seconds. Video is set to music and no words are s
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Language of Mathematics II (43): Exponents and Radicals (2 of 3)
Continuing from Parts 40, 41, and 42, the instructor discusses the 'language' of exponents and radicals. The instructor is outside using a concrete wall.
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7.3 Review the whole process

Before you file away your assignment and return to your current study, spend a little time reviewing the whole process of preparing, exploring, implementing and reviewing your assignment. Review what you did and how you did it in each of the four phases. Trying to identify just one thing that went well and one thing that you could have done differently can help you in your future study. Remember that your review should focus on the process of the preparation
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How to Secure a Wireless Internet Connection
Wireless connection should be secured so that only authorized people can access the network. Find out how most wireless configuration utilties are browser-based-go to a specific web address and you will be able to access the settings.
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