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How the oil lamp produces light through ...

How the oil lamp produces light through a wick that is lit using a match ?

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The wick of lamp is made from thin fibers of cotton .The phenomena of capillary exist through these thin fibers and oil is continuously to grow and hence flame of lamp is exist.
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Light of wavelength 488 nm is produced by an argon laser which is used in the photoelectric effect. When light from this spectral line is incident on the emitter, the stopping (cut-off) potential of photoelectrons is 0.38 V. Find the work function of the material from which the emitter is made.

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To demonstrate the process of thermoelectric production with a model. Apparatus and materials: Pressure cooker, pipe, tennis ball, metal sheet, dynamo, bulb. Procedure : rarr Take a table-tennis ball and make three slits into it. rarr Put semicircular fins cut out of a metal sheet into these slits. rarr Pivot the tennis ball on an axle through its centre with a straight metal wire fixed to a rigid support. Ensure that the tennis ball rotates freely about the axle. rarr Now connect a cycle dynamo to this. rarr Connect a bulb in series. rarr Direct a jet of water or steam produced in a pressure cooker at the fins. Note down your observation. Observation : The bulb gets lighted. Which structure in the model acts as a turbine ?

To demonstrate the process of thermoelectric production with a model. Apparatus and materials: Pressure cooker, pipe, tennis ball, metal sheet, dynamo, bulb. Procedure : rarr Take a table-tennis ball and make three slits into it. rarr Put semicircular fins cut out of a metal sheet into these slits. rarr Pivot the tennis ball on an axle through its centre with a straight metal wire fixed to a rigid support. Ensure that the tennis ball rotates freely about the axle. rarr Now connect a cycle dynamo to this. rarr Connect a bulb in series. rarr Direct a jet of water or steam produced in a pressure cooker at the fins. Note down your observation. Observation : The bulb gets lighted. Which energy conversion do you think is taking place in this model ?

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KUMAR PRAKASHAN-MECHANICAL PROPERTIES OF FLUIDS -SECTION -C (Objective Questions) (VSQs)
  1. Why tefllon is coated ,the angle of contact between oil and non -stick...

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  2. Why raincoat does not wet in rain ?

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  3. Water rises to a height of 20 mm in a capillary . If the radius of th...

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  4. How the oil lamp produces light through a wick that is lit using a mat...

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  5. Why the moisture is retained in soil when a farm is being plough ?

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  6. Why it is better to wear cotton clothes in summer ?

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  7. Why the refill of marker pen which is used to write on white board is ...

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  8. Why does the water rise in a capillary tube Explain .

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  9. Why does the mercury fall in a capillary tube ?

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  10. A 20 cm long capillary tube is dipped in water The water rises upto 8 ...

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  11. In incompressible flow the density of a fluid changes with time and po...

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  12. Non -viscous flow can be a streamline.

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  13. In a steady flow velocity of the fluid at each point remains identical...

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  14. The Bernoulli equation can be considered to be a statement of the cons...

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  15. The angle of contact between drop of water and material of raincoat is...

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  16. Absence of roughness between two consecutive layers of fluid is the vi...

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  17. If the weight of body is greater than the buoyant force of liquid then...

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  18. Velocity of water at the depth in river is always slow.

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  19. Assertion : For turbulent flow Reynolds number R(e)gt2000. Reason ...

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  20. Assertion : A needle placed carefully placed on the surface of water m...

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