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Assume (unrealistically ) that a TV stat...

Assume (unrealistically ) that a TV station acts as a point source broadcasting isotropically at 1.0 MW. What is the intensity of the transmitted signal reaching proxima Centauri the star nearest our solar system 4.3 ly away ? A light -year (ly) is the distance light travels in one year .

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`4.8xx10^(-29) W//m^(2)`
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Astronomical distances are so large compared to terrestrial ones that much larger units of length are used for easy comprehension of the relative distances of astronomical objects. An astronomical unit (AU) is equal to the average distance from Earth to the Sun, 1.50xx10^(8)km . A parsec (pc) is the distance at which 1 AU would subtend an angle of 1 second of arc. A light year (ly) is the distance that light, traveling through a vacuum with a speed of 3.00xx10^(5) km/s, would cover in 1 year. Express a light - year and a parsec in kilometers.

Question Stimulus :- DIRECTIONS: Read the following passage carefully and answer the questions given below it. Long, long ago in a big forest, there were many trees, among the cluster of trees, there was a very tall pine tree. He was so tall that he could talk to the stars in the sky. He could easily gaze over the heads of the other trees. One day, late in the evening, the pine tree saw a little girl approaching him. He could see her only because of his height. She was in tears. The pine tree bent as low as he could and asked the weeping girl. ‘What is the matter? Why are you crying?’ the little girl, still sobbing replied, ‘I was gathering flowers for the goddess Durga, Who I believe, would help my parents to overcome their poverty and I have lost my way’. The pine tree said to the little girl, ‘It is late in the evening. It will not be possible for you to return to your house, which is at the other end at the forest. Sleep for the night at this place.’ The pine tree pointed out to an open cave­like place under him. The little girl was frightened of wild animals. The girl quickly crept into the cave-­like place. The pine tree was happy and pleased with himself. He stood like a soldier guarding the place. The girl woke up in the morning and was amazed to see the pine tree standing like a guard outside the cave. Then her gaze travelled to the heap of flowers that she had gathered the previous night. The flowers lay withering on the ground. The pine tree understood what was going on in the girl’s mind. He wrapped his branches around the nearby flower trees and shook them gently. The little girl’s eyes brightened. But a great surprise awaited her. The pine tree brought out a bag of gold coins which had been lying for years in the hole in its trunk and gave it to the girl. With teary eyes she thanked her benefactor and went away. Why was little girl crying ?

Question Stimulus :- DIRECTIONS: Read the following passage carefully and answer the questions given below it. Long, long ago in a big forest, there were many trees, among the cluster of trees, there was a very tall pine tree. He was so tall that he could talk to the stars in the sky. He could easily gaze over the heads of the other trees. One day, late in the evening, the pine tree saw a little girl approaching him. He could see her only because of his height. She was in tears. The pine tree bent as low as he could and asked the weeping girl. ‘What is the matter? Why are you crying?’ the little girl, still sobbing replied, ‘I was gathering flowers for the goddess Durga, Who I believe, would help my parents to overcome their poverty and I have lost my way’. The pine tree said to the little girl, ‘It is late in the evening. It will not be possible for you to return to your house, which is at the other end at the forest. Sleep for the night at this place.’ The pine tree pointed out to an open cave­like place under him. The little girl was frightened of wild animals. The girl quickly crept into the cave-­like place. The pine tree was happy and pleased with himself. He stood like a soldier guarding the place. The girl woke up in the morning and was amazed to see the pine tree standing like a guard outside the cave. Then her gaze travelled to the heap of flowers that she had gathered the previous night. The flowers lay withering on the ground. The pine tree understood what was going on in the girl’s mind. He wrapped his branches around the nearby flower trees and shook them gently. The little girl’s eyes brightened. But a great surprise awaited her. The pine tree brought out a bag of gold coins which had been lying for years in the hole in its trunk and gave it to the girl. With teary eyes she thanked her benefactor and went away. Which word in the passage means ‘the state of being extremely poor’?

Question Stimulus :- DIRECTIONS: Read the following passage carefully and answer the questions given below it. Long, long ago in a big forest, there were many trees, among the cluster of trees, there was a very tall pine tree. He was so tall that he could talk to the stars in the sky. He could easily gaze over the heads of the other trees. One day, late in the evening, the pine tree saw a little girl approaching him. He could see her only because of his height. She was in tears. The pine tree bent as low as he could and asked the weeping girl. ‘What is the matter? Why are you crying?’ the little girl, still sobbing replied, ‘I was gathering flowers for the goddess Durga, Who I believe, would help my parents to overcome their poverty and I have lost my way’. The pine tree said to the little girl, ‘It is late in the evening. It will not be possible for you to return to your house, which is at the other end at the forest. Sleep for the night at this place.’ The pine tree pointed out to an open cave­like place under him. The little girl was frightened of wild animals. The girl quickly crept into the cave-­like place. The pine tree was happy and pleased with himself. He stood like a soldier guarding the place. The girl woke up in the morning and was amazed to see the pine tree standing like a guard outside the cave. Then her gaze travelled to the heap of flowers that she had gathered the previous night. The flowers lay withering on the ground. The pine tree understood what was going on in the girl’s mind. He wrapped his branches around the nearby flower trees and shook them gently. The little girl’s eyes brightened. But a great surprise awaited her. The pine tree brought out a bag of gold coins which had been lying for years in the hole in its trunk and gave it to the girl. With teary eyes she thanked her benefactor and went away. hy was little girl crying ?

A monochromatic point source (S_(1)) is at a distance d from a screen. Another identical source (S_(2)) is at a large distance from the screen. The two sources are on a line which is perpendicular to the screen. Sources are coherent. What is the shape of interference fringes on the screen? (b) Three identical coherent sources are placed on a straight line with two neighbouring ones separated by a distance "d = 0.06 mm" . The sources produce monochromatic light of wavelength lambda" = 550.4 nm" . A line AB is located at a distance D = 2.50 m from the sources and is perpendicular to line joining the three sources. Intensity of light at P with any one of the sources switched on is I_(o) . Find the intensity when all three sources are switched on. Distance of point P from O is "y = 1.72 cm (see figure)"

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