product was then distilled using a Hickman still and characterized using infrared spectroscopy. The percent yield of isopentyl acetate was 61.52%. This may have been low due to not all of the condensed product being removed from the Hickman still‚ some product being lost during transfer of the product from the reaction tube into the Hickman still‚ or the loss of some product due to evaporation during distillation. Infrared spectrum analysis of the product indicated that the product was isopentyl
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the metal becomes warm‚ although its appearance doesn’t change. As it heats up‚ it begins to glow dull red‚ then orange‚ brilliant yellow‚ and finally white. How do we explain this? When the metal is at room temperature‚ it emits only invisible infrared radiation. As
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Arrogant c. Auspicious d. Joyful 8. What is the missing number? 1 4 9 ? 25 a. 15 b. 16 c. 18 d. None of these The rate of interest obtained is a. 12.5% b. 13.5% c. 15% d. 16 2/3% 10. The ozone layer restricts a. Visible light b. Infrared radiation c. X-rays and gamma rays d. Ultra violet radiation Ans: ( d ) Ans: ( c ) Ans: ( b ) 9. A man bought 20 shares of Rs 50 at 5 discount‚ the rate of dividend being 13 ½ . Ans: ( b ) Ans: ( b ) Part II: Descriptive type: Duration 45 Minutes Attempt any two
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We have been reading a story by Ray Bradbury from the collection The Golden Apples of the Sun called A Sound of Thunder‚ it is a futuristic story about the consequences of time travel and how changing a small thing can result in a huge change somewhere down the timeline‚ the best way of describing this change is to imagine a single mouse‚ you kill the mouse then you stop the families of that mouse from being produced and so the families of those families‚ maybe millions of mice and for want of a
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technology) is a sub-discipline of military tactics and passive electronic countermeasures‚[1] which cover a range of techniques used with personnel‚ aircraft‚ ships‚ submarines‚ and missiles‚ to make them less visible (ideally invisible) to radar‚ infrared‚[2] sonar and other detection methods. It corresponds to camouflage for these parts of the electromagnetic spectrum. Development in the United States occurred in 1958‚[3][4] where earlier attempts in preventing radar tracking of its U-2 spy planes
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The Veldt In the short story “The Veldt" by Ray Bradbury‚ everything starts with the purchase of their new family home. This home was not your average home because where other homes flawed this house seemed to have perfected itself. This house had features that would cater to the family such as feed them‚ sing to them‚ and even nurture them "nothing was to good for their children" said George. The greatest feature was the nursery. What this nursery would do‚ was catch the telepathic emanations of
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realities‚ and their father’s differences in child rearing dramatically affect their respective senses of security and happiness. Danny and Reuven‚ an Unbelievable Friendship On one side of the visible light spectrum is ultra-violet rays‚ and on the other‚ infrared rays. If two people were to stand on a visible light spectrum and represent their personalities based on where each other stand‚ David Malter would stand on one side‚ and miles away‚ possibly not even on the spectrum would be Isaac Saunders
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indicator lamps in many devices and are increasingly used for general lighting. Appearing as practical electronic components in 1962‚ early LEDs emitted low-intensity red light‚ but modern versions are available across the visible‚ ultraviolet‚ and infrared wavelengths‚ with very high brightness.When a light-emitting diode is switched on‚ electrons are able to recombine with holes within the device‚ releasing energy in the form of photons. This effect is called electroluminescence‚ and the color of
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above what it would be in the absence of the gases.[1][2] Solar radiation at the frequencies of visible light largely passes through the atmosphere to warm the planetary surface‚ which then emits this energy at the lower frequencies of infrared thermal radiation. Infrared radiation is absorbed by greenhouse gases‚ which in turn re-radiate much of the energy to the surface and lower atmosphere. The mechanism is named after the effect of solar radiation passing through glass and warming a greenhouse‚ but
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can provide a valuable contribution. KEYWORDS: - THz technology‚ THz spectroscopy‚ THz sciences. I. INTRODUCTION The term ‘T-rays’ was coined in the early 1990’s by Bell Labs to describe the spectrum in the Terahertz range (1 THz = 1012). [1] The terahertz region of the spectrum lies on the border of where electronics and optics meet between the mm-wave and infrared bands (100 GHz-10 THz). THz wave could handle ultra broad band signals ‚ have very large absorption due to water or water vapours
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