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Importance of Physical Exercise according ot age and sex

Importance of Physical Exercise according ot age and sex According to Age: Physical education is applicable for people of all ages. But programmes of physical education differ likings and dislikings for different age-groups. Not only physical exercise but also food, likings and dislikings and physical abilities are different for different age-groups. For example, physical ability of children is not equal to that of adults.  So to develop the abilies exercise through games should be introduced accordingly. Frog jumps, touch and back, crow jump or recreational games are some physical activities that can improve physical ability of children. Selection of exercise and games for adolescent should be done systematically. Standing in a line, exercise of hands and legs, running with a ball, touch and play, etc. and games and physcial exercise can be used to develop physical abilities of children. Remember, children and adolescents should not participate in weight lifting exercise. It causes h

Nature of Light

Light is an electromagnetic radiation. Although light is only a tiny part
of the electromagnetic spectrum, it has been the subject of much
research both in physics and in biology. The importance of light is due
to its fundamental role in living systems. The sun is still the major
source of light in the world. The sun is both beneficial and hazardous
to our health.

The three general categories of light ultra-violet (UV), visible and
infrared (IR). They are defined in terms of their wavelengths.
Ultraviolet light has wave lengths from about 1000 to 4000 A0; visible
light extends from about 4000 to 7000 A0 and IR light extends form
about 7000 to 100000 A0.

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