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Archive for the ‘Everyday Science Questions’ Category

What? That sounds insane, but remember there is a load of crazy stuff in science that we can learn and enjoy from. I do not mean burning your money is fun, neither I would give in to the challenge if I am not confident I could actually have it back in exactly the same condition as it should be. You can practice this using ordinary white paper or filter paper cut into note-like sizes, that is to build up your confidence that it truly works. So, have fun and burn your money away. (more…)

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Physics is so dear to me, although many students and science teachers alike do not feel good with it. To some, it is boring and full of Maths. Others just do not find it attractive to their intellect, I should say.  But to me, it is full of wonders and an endless chain of discoveries. One of my favourite topics in this field is Space and the Universe.  It appeals to me differently because I feel like watching a movie and doing some reflection at the same time.

Just like the stars that we glimpse in the sky on quite nights, they are full of excitement. They are part of the history that unfolds before our senses, because the stars that you see were actually there many years ago. Stars are light years away from the Earth, and so it would take years for its emitted light to reach us. A light year is a distance that light can travel in one year.  If a ray of light travels in a vacuum in approximately 3×108 m/s, the ray of the sun which distance from the Earth is approximately 150 million kilometres could reach the Earth in eight minutes, how much more for distant stars? (more…)

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Many students would still find it confusing to understand the phenomenon of high tide and low tide.  What causes it and why?

 

Simple reason is to associate it to gravity of the Earth and the Moon, and the pull of force is called gravitational force. Gravitational force exists between two objects with mass.  (more…)

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The sky is blue especially during bright days due to Rayleigh scattering. This scattering is the elastic scattering of electromagnetic radiation including light, by particles much smaller than the wavelength of the light. It can happen notably when light travels through gases or air. Rayleigh scattering of sunlight results in diffuse sky radiation, which is primarily the reason why the sky is blue and the sun look yellow.

As light travels through the atmosphere, most of the longer wavelengths just pass through straight away whilst some of the red, orange and yellow light, is affected by the air. Much of the shorter wavelength light, like the blue wavelength, is absorbed by the gas molecules, which is then radiated in different directions. It scattered all around the sky and so the blue colour seemed to occupy much of the sky.

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