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Bohrs Atomic Model

Bohrs Atomic Model Scientist Neils Bohr gave some corrections to Rutherford's atomic model in 1913. This corrected model is called the Bohr's atomic model. The main postulates of this model are - a) The electron moves around the nucleus in a circular motion, about an axis. This circular motion is called an energy level or orbit. They are also known as the shell or permanent orbit or principal energy level. Electrons do not absorb or emit any energy when they revolve these fixed orbits. If we express the permanent orbit as n, then n = 1, 2, 3, 4, etc.  In other words, if n = 1, the principal energy level is K,  when n = 2, L is the principal energy level,  when n = 3, M is the principal energy level,  when n = 4, N is the principal energy level, etc. b) According to Bohr's model, the angular momentum of an electron in an energy level is mvr =  nh / 2𝜋 . Here, m = the mass of the electron (9.11×10 -31  kg) r = the radius of the orbit that the electron follows v = the veloc

Importance of Physical Exercise according to age and sex

Importance of Physical Exercise according to age and sex

According to Age: Physical education is applicable for people of all ages. But programs of physical education differ in likings and dislikings for different age groups. Not only physical exercise but also food, likings and disliking, and physical abilities are different for different age groups. For example, the physical ability of children is not equal to that of adults.

So to develop the ability exercise through games should be introduced accordingly. Frog jumps, touch, and back, crow jump, or recreational games are some physical activities that can improve the physical ability of children. The selection of exercise and games for adolescents should be done systematically. Standing in a line, the exercise of hands and legs, running with a ball, touch, and play, etc., and games and physical exercise can be used to develop the physical abilities of children. Remember, children and adolescents should not participate in weight lifting exercises. It causes harm to the body. Youths should take part in exercise systematically. So they can learn skills of different games which will build foundations in sports. We should keep in mind that exercise may cause fatigue among students. The selection of physical exercise for a specific part of the body is essential. Physical ability may be acquired in this way. For elderly people, light physical exercise is required for maintaining physical ability.

According to Sex: Though physical education is equally important for all, it depends on how much we can implement it. And though it is different for men and women, it cannot be so for childhood. The physical structures of boys and their childhood are more or less the same. Priority should be given to recreational games, limiting activities, jumping and running, etc. at the time of designing physical education programs for children. To ensure the mental development of children, physical education programs for children should be implemented through games and sports. There is little difference between boys and girls during 7 - 12 years of age. For example, badminton, table tennis, running, etc. are a few individual games. From this stage, physical education programs should be separated to develop their physical capacities. After the reach of puberty, physical changes take place among boys and girls. For this reason, their activities are also different. Boys like athletics, swimming, etc. besides team games. Most of the boys do not hesitate to take a risk at this stage. 

In the behavior of girls, hesitation and shyness appear due to their physical changes. This is why physical education programs of girls differ from that of boys in games and sports competitions such as swimming, athletics, badminton, table tennis, etc. For boys and girls, there are big differences in physical strength and tolerance, physical education activities are different. Therefore, as children grow up, differences in their physical activities become distinct. Boys and girls participate in these activities separately.

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