National Bird Day is celebrated every year on 5 January . This day is observed to spread awareness about birds, their importance in nature, and the need to protect them. Birds are beautiful living beings and play a very important role in keeping our environment healthy. Origin of National Bird Day National Bird Day was first celebrated in the year 2002 . It was started by bird lovers and environmental groups to protect birds from dangers like deforestation, pollution, and illegal hunting. The main aim of this day is to teach people, especially students, why birds are important and how we can help save them. Why Is National Bird Day Celebrated Every Year? National Bird Day is celebrated every year because many bird species are disappearing due to human activities. Cutting trees, using plastic, pollution, and climate change are harming birds and their homes. This day reminds us that: Birds need protection Nature should be respected Everyone has a responsibil...
X-ray spectra X-rays X-rays were discovered by a German physicist Wihelm Conrad Roentgen in 1895 during the study of the properties of cathode rays. These rays are actually electromagnetic rays of lower wavelengths having range from 10 Å to 0.5 Å. Higher wavelength side X-rays are soft X-ray and the lower wavelength side X-rays are hard X-ray. Properties of X-rays Since the X-rays do not deflect by electric and magnetic fields, hence they does not consist of charged particles. X-rays are electromagnetic radiation of very short wavelength. X-rays affect photographic plate like light, but their effect is much more intense than light. X-rays travel in straight lines with the velocity of light. They produce fluorescence in several materials. X-rays ionize the gas through which they pass. X-rays have high penetrating power and can pass through many solids. They produce photo electric effect also. X-rays also show in...