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1. What is dispersion? Which colour gets relatively more dispersed?
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Dispersion is the separation of white light into its constituent colors (spectrum) due to the different refractive indices of different wavelengths of light, with violet light being bent (or deviated) the most and red light the least. |
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2. Define Modulation. Why is it necessary?
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Modulation, in telecommunications, is the process of varying one or more properties of a carrier signal (like frequency or amplitude) according to the informaation signal (the message). It is necessary to transmit signals efficiently over long distances and allows for the transmission of multiple signals through the same medium. |
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3. A circular coil if radius 'r' having N turns carries a current I. What is its magnetic moment?
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Magnetic moment of the coil is : μ=INA=πR2IN |
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4. Define magnetic declination
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It is also known as magnetic variation. It is the angle between true )geographic) North and magnetic North at a particular location. |
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5. What is work function?
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The minimum energy required by an electron to escape from metal surface is called work function. |
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6. Abtransformer converts 200 V AC to 2000 V AC. Calculate the number of turns in the secondary if the primary has 10 turns.
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100 |
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7. Magntic lines form continuous closed loops. Why?
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Because magnetic monopoles donot exist; they always occur in paurs (North and South) and field lines connect these lines forming the closed loops. |
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8. Microwaves are used in radars. why?
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Microwaves are used in radars because their short wavelengths allow for the creation of narrow, focused beams, eneabling accurate detection and ranging of objects even in challenging weather conditions. |
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