[Review] Meet Science: Light and Sound – Top Picks!
Meet Science' inspires all school-aged kids to explore fundamental concepts of Magnetism and Electricity (1st Edition) with variety of fun features such as. Learn about the properties of light waves and how they can be reflected, refracted and dispersed with BBC Bitesize KS3 Science. Hands-On Science: Sound and Light [Jack Challoner, Maggie Hewson] on kd8mq.info *FREE* shipping on qualifying offers. These giant books containing.
For a wave moving across the surface of a sea, the equation relates how fast a tiny piece of water is physically deforming, at any particular instant, in space on the left and time on the right.
The wave equation had a long genesis, with scientists from many fields circling around its mathematics across the centuries. Among many others, Daniel Bernoulli, Jean le Rond d'Alembert, Leonhard Euler, and Joseph-Louis Lagrange realised that there was a similarity in the maths of how to describe waves in strings, across surfaces and through solids and fluids.
Bernoulli, a Swiss mathematician, began by trying to understand how a violin string made sound. In the s, he worked out the maths of a string as it vibrated by imagining the string was composed of a huge number of tiny masses, all connected with springs. Applying Isaac Newton's laws of motion for the individual masses showed him that the simplest shape for vibrating violin string, fixed at each end, would be the gentle arc of a single sine curve. A violin string or a string on any instrument, for that matter vibrates in transverse waves along its length, which creates longitudinal waves in the surrounding air, which our ears interpret as sound.
Meet Science: Light and Sound on the App Store
Some decades later, mathematician Jean Le Rond d'Alembert generalised the string problem to write down the wave equation, in which he found that the acceleration of any segment of the string was proportional to the tension acting on it. The waves created by different tensions of the string produce different notes — think of how the sound from a plucked string can be changed as it is tightened or loosened. The wave equation started off describing movement of physical stuff but it is much more powerful than that.
Mathematically, it can also describe, for example, the movement of heat or electrical potential, by changing "y" from describing the deformation of a substance to the change in the energy of a system. Not all waves need to travel through a material. Bythe physicist James Clerk Maxwell had derived his four famous equations for the interactions of the electric and magnetic fields in a vacuum around charged particles.
He noticed that the expressions could be combined to form wave equations featuring the strength of the electric or magnetic fields in the place of "y".
And the speed of these waves the "v" term in the equation was equal to the speed of light. This simple mathematical re-arrangement was one of the most significant discoveries in the history of physics, showing that light must be an electromagnetic wave that travelled in the vacuum.
Electromagnetic waves, then, are transverse oscillations of the electric and magnetic fields. Discovering their wave-like nature led to the prediction that there must be light of different wavelengths, the distance between successive peaks and troughs of the sine curve. It was soon discovered that wavelengths longer than visible light include microwaves, infrared and radio waves; shorter wavelengths include ultraviolet light, X-rays and gamma rays.
The wave equation has also proved useful in understanding one of the strangest, but most important, physical ideas in the past century: What we love… Very educational, great visual presentation.
Summary A fantastic app to supplement lessons on light and sound, best suited for children ages 10 and up. Our Rating It has 3 e-books that teach about light. The second book, Bends When It Hits, covers colors of the rainbow, prisms, infrared light, ultraviolet light, refraction, concave lens, convex lens, and how we see with our eye. The third book, Bouncing In The Same Way, discusses reflection and refraction, the angle of light in relation to the angle of reflection, light absorption, convex and concave mirrors, and fiber optics.
It has 3 e-books that teach about sound. The first book, Just Like Ocean Waves, talks about how sound is produced, how we hear, and the science of sound. In this book, children will learn about transverse and longitudinal sound waves, crest, trough, wavelength, amplitude, and frequency. The second book, Secret of Height and Size, gets into detail about frequency, pitch, hertz, and decibels. The third book, We are Similar, discusses how light and sound are alike in the way they travel, reflect, and retract.
Each book is followed by a short quiz consisting of three questions.
It ends with 2 or 3 videos of experiments that relate to the concepts introduced in the book. These experiments can also be done at home with adult supervision.