Tulsi Prajna 2003 04

SR No.: 524615
Original Sutra Author: N/A
Author: Shanta Jain, Jagatram Bhattacharya
Publisher: Jain Vishva Bharati
Publication Year: 2003
Total Pages: 122
Language: Hindi
Classification: Magazine, India_Tulsi Prajna, & India
File Size: 6 MB

Page 106

7. Like light X-rays can also cause photoelectric effect. 8. They travel in straight line and while doing so, they cast the
shadows of the object falling in their path. X-rays can undergo reflection, refraction, interference, diffraction
and polarisation. 10. X-rays can penetrate the materials that are opaque to visible or
ultra-violet light. They can easily pass through paper, thin sheet of metals, wood, flesh, etc. but they cannot penetrate denser
objects such as bones, heavy metals etc. 11. They have injurious effect on human bodies. Exposure of human
body to X-rays causes reddening of the skin. The long exposures
result into surface sores. 2.
When X-rays fall on certain metals, secondary X-ray are produced, which are characteristic rays of the metal. The secondary X- rays
are accompanied by fast moving electrons. 60. Text Book of Physics, op cit. pp. 97-98—
"This discussion shows that, at a point where an electromagnetic wave is passing, the electric and the magnetic field vectors oscillate in phase along mutually perpendicular directions, and are both located in a plane which is perpendicular to the direction of propagation of the wave.
To be more specific, these oscillations have the following meaning. If at any point at a specific time, the Ē and B vectors have zero values, their values will increase with the time along two mutually perpendicular directions, then reach their maximum values simultaneously and start decreasing; again reaching zero. Then they reverse their directions, reach their maxima and again decrease. This way the field vectors oscillate along mutually perpendicular directions, remaining confined to a plane which is perpendicular to the direction of the electromagnetic wave, so long as the wave is propagated through that point. It should also be noted that in this process, the kinetic energy of the charge oscillating between the two spheres is radiated away in the form of the energy of electromagnetic radiation, which propagates in the space. The frequency of the waves generated is the same as the frequency of the oscillation of charge between the spheres. The expression c(velocity)=(wavelength) xf (frequency) holds true. Thus, if one wants to generate waves of 300 meter wavelength, the frequency of oscillations should be 300 x 106.
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