Uses of light bulbs and their structure
The electric lamps Electric lamps are tools that convert the electric energy into the light energy by passing the electricity through them , There are different types of the electric lamps , but the...
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The volcanoes and the safety precautions must be taken at the occurrence of the volcanoes .
The volcanoes There are thousands of volcanoes on the Earth’s surface . But sixty one only of them are active as an evidence of the permanent activities and movement beneath the Earth’s crust ....
Earthquakes and safety precautions must be taken at the occurrence of earthquakes
The earthquake The earthquakes The earthquakes are rapid and successive shakes of the ground which take place one after the other , Every day , the Earth’s crust is exposed to nearly 400 earthquakes...
Mechanical waves and some technological applications of sound mechanical waves
The mechanical waves The mechanical waves are the waves which propagate through a material medium ( the solid , the liquid , or the gas ) at a wave speed which depends on the ...
Examples and some technological applications of electromagnetic waves
The electromagnetic waves The electromagnetic waves are formed when an electric field couples with a magnetic field . The magnetic and electric fields of an electromagnetic waves are perpendicular to each other and to...
The lunar eclipse and safety precautions on observing the lunar eclipse
The lunar eclipse The lunar eclipse occurs when the Sun , the Earth and the moon are nearly on one straight line with the Earth in the middle hiding the sunlight from the moon...
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