fourth grade science terms

Basic Terms Connected to Waves - The four important terms used in the study of waves are Wavelength, Amplitude, Frequency and Wave velocity. Wavelength ' l ' is the distance between two consecutive points on the wave which are in the same phase. (same phase means same state of v..

As wavelength is the distance covered during one oscillation and frequency is the number of oscillations per second, the product of the wavelength and frequency would give us the wave velocit..

For a layman the term 'work' implies any activity resulting in muscular or mental exertion. In physics, however, the term has a different meaning. It represents a physical quanti..

The term 'energy' used here has thus a slightly different meaning. The term 'energy' actually means 'the useful energy' or 'the energy that we can use'; for cooking, operating machines, to run vehicles and so on. And we get this useful energy only from specific sources, wh..

Introduction - For a layman the term 'work' implies any activity resulting in muscular or mental exertio..

The term environment refers to the natural elements that make up the earth and surround living organisms, making life processes possibl..

Matter can be broadly divided into two major groups, 'Pure' and 'Impure'. In chemistry, the term 'purity' acquires quite a different meaning from what we understand it to be in our day-to-day lif..

Question: What do you understand by the term 'magnetic field'? Answer: Magnetic field is a region near a magnetised body where magnetic forces can be detecte..

Taking in of food or eating is termed ingestion. The food taken in can be big or small particles. There may be by specialised organs such as mouth in higher animals and through the general body surface with the help of structures such as pseudopodia in lower animals. Ingestion by pseudop..

Evolution - It is clear that there is an inherent tendency to variation in sexual reproduction. An error in DNA copying during sexual reproduction also causes changes as we shall see. The long-term consequences of the accumulation of variations in species, is the basis for evolution and d..