Nandanvana

Author(s): N L Jain
Publisher: Parshwanath Vidyapith

Page 52

(32) : Nandanavana
ball is getting smaller and smaller moving in the direction opposite to the train. However, if there is another observer static and outside the train, he would look the falling ball making a curve without changing the size and direction. (it means a single event is seen by different persons differently under static and moving conditions).
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(b) Relativity of Time
Assume there are twin brothers of age 25 and both are astronauts. One of them moves in a spaceship upwards while the other remains on the earth in control room. The spaceship sends messages after every ten minutes. However, as the spaceship moves faster and faster upwards towards attaining the speed of light, the control room gets messages at longer and longer intervals. It has been calculated that if the spaceship remains in space for two years, the brother in space will attain an age of 27 years while his brother on earth will have an age of 70 years. This suggests that time is effected by static and moving conditions and is shortened at higher speeds. This also leads to the possibility of past and future reading-a part of omniscience.
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(c) Relativity of Length *
Suppose a rod has a length of 15 cms. It is true for a stationary observer. However, if the same rod is carried by a person moving, say in a fast spaceship, it will have a length of less than 15 cms. (There is a contraction in length like time showing variability and relativity of length).
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(d) Relativity of Mass
A body weighs 50 kg on a balance here. It is its equatorial weight. If the same body is taken at poles, it will weigh more than 50 kg. However, if the same mass is carried by a person moving fast, it will show higher and higher weight depending on the speed of movement. (e) Looking of Images in the Past
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When one observes his image in the mirror, it is not the image of the moment of vision. It is the image of the past instant, as light must have taken some time to go and come back to the eye. The distant stars we see are the stars of many light years ago as light has taken so many years to reach us. Thus, there is no simultaneity of our observation and reality. We see the past, not present. There are many more such observations we need not describe.