The Twin Paradox


The Twin Paradox


The relativistic effects give rise to a famous so-called    paradox    of   two persons, say A and B, who are twins, born at the same time. Suppose that A flies away in a space ship at a speed comparable to the speed of light, leaving B stationary on the ground.


 B sees A moving fast, so that A’s clock appears to go slower from B’s point of view. If A comes back, he will find his twin brother B older than himself. The paradox arises from the contention that all motion is relative; so either twin could consider the other to be moving.

 Thus each should find the other younger, which is a logical contradiction. This contention presupposes that the twins situations are symmetrical and interchangeable. But this is not true. For the twins to meet and make the comparison, A has to turn around to come back. 

When the turns around, he feels the acceleration, while B feels nothing. Thus the situation is not symmetrical: there is a difference between the twins in the absolute sense. 


So the man (here A) who has felt the acceleration would be younger, and the paradox is resolved. 

In fact, it is one aspect of the theory of relativity which has been clearly demonstrated. Just as the mu-mesons live longer when they are moving, so will A live longer when he is travelling.   


Comments

Post a Comment

please do not enter any spam link in the comment box

Popular posts from this blog

PRIZE

Image
                                                 PRIZE Prize – Field 1.       Oscar – Film 2.       Dada Sahib Phalke – Film 3.       Grammy – Music 4.       Pulitzer – Journalism and Literature 5.       Arjuna – sports 6.       Bowelay – Agriculture 7.       Kalinga – Science 8.       Dhanwantri – Medical Science 9.       Bhatnagar – Science 10.   Nobel Prize – Peace, Literature, economics, Physics, Chemistry, Medical Science, 11.   Abel – Mathematics 12.   Merlin – Magic 13.   Bharat Ratna – Art, Science, Public Service, Sports 14.   Vyas Samman – Hindi Literature 15.   Bihari Award – Literature 16.   Saraswati Samman – Literature 17.   Man Booker – Literature 18.   Vachspati Samman – Sanskrit Literature 19.   Param Vir Chakra – Military 20.   Ashok Chakra – Civilians 21.   Juliet Curie Award – Peace 22.   Dronacharya Award – Sports Coaches 23.   Sahitya Akademi award – Literary 24.   Kalidas samman – Classic
Read more

Foot in human body

Image
                FOOT FOOT • SOLE OF THE FOOT • THICK AND HAIRLESS. • IT IS FIRMLY BOUND DOWN TO THE UNDERLYING DEEP FASCIA BY NUMEROUS FIBROUS BANDS. • THE SKIN SHOWS A FEW FLEXURE CREASES AT THE SITES OF SKIN MOVEMENT. • SWEAT GLANDS ARE PRESENT IN LARGE NUMBERS. FOOT • SENSORY NERVE SUPPLY: • MEDIAL CALCANEAL BRANCH OF THE TIBIAL NERVE - WHICH INNERVATES THE MEDIAL SIDE OF THE HEEL; • BRANCHES FROM THE MEDIAL PLANTAR NERVE- WHICH INNERVATE THE MEDIAL TWO THIRDS OF THE SOLE • BRANCHES FROM THE LATERAL PLANTAR NERVE - INNERVATE THE LATERAL THIRD OF THE SOLE FOOT • DEEP FASCIA • THE PLANTAR APONEUROSIS IS A TRIANGULAR THICKENING OF THE DEEP FASCIA THAT PROTECTS THE UNDERLYING NERVES, BLOOD VESSELS, AND MUSCLES. • ITS APEX IS ATTACHED TO THE MEDIAL AND LATERAL TUBERCLES OF THE CALCANEUM. • THE BASE OF THE APONEUROSIS DIVIDES INTO FIVE SLIPS THAT PASS INTO THE TOES. MUSCLESOF THE FOOT • CHIEFLY CONCERNED WITH SUPPORTING T
Read more

BRACHIAL PLEXUS

Image
BRACHIAL PLEXUS BRACHIAL PLEXUS u the nerve fibers derived from different segments of the spinal cord to be arranged and distributed efficiently in different nerve trunks to the various parts of the upper limb. u The brachial plexus is formed in the posterior triangle of the neck by the union of the anterior rami of the 5th, 6th, 7th, and 8th cervical and the 1st thoracic spinal nerve. COMPONENTS u Roots – C5 – T1 u Trunks – Upper – C5 and C6, Middle – C7, Lower – C8 and T1 u Divisions – Anterior and Posterior u Cords –in relation to the AXILLARY ARTERY u – Lateral Cord - anterior divisions of the upper and middle trunk u - Medial Cord - the anterior division of the lower trunk u - Posterior Cord - the posterior divisions of all three trunks u Branches CORD u lie above and lateral to the first part of the axillary artery u MEDIAL CORD - crosses behind the artery to reach the medial       side of the second part of the artery. u
Read more