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Why does friction increase if the two su...

Why does friction increase if the two surfaces are pressed ?

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BINA LIBRARY-ELEMENTS OF PHYSICS ii-EXERCISE
  1. What is the wavelength range of gamma-rays ? State two uses of gamma-r...

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  2. State various uses of radiowaves.

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  3. Why does friction increase if the two surfaces are pressed ?

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  4. Give three examples to show that friction is increased deliberately

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  5. What are microwaves?

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  6. The electric field vector of a plane e.m. wave oscillates with frequen...

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  7. The electric field vector of a plane e.m. wave oscillates with frequen...

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  8. In an e.m. wave amplitude of electric field is E0 = 60 N/C and its fre...

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  9. In an e.m. wave amplitude of electric field is E0 = 60 N/C and its fre...

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  10. About 10% of the power of a 100W light bulb is converted to a visible ...

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  11. About 10% of the power of a 100W light bulb is converted to a visible ...

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  12. Name the radiations of electromagnetic spectrum which are used in warf...

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  13. Name the part of electromagnetic spectrum which is suitable for radar ...

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  14. Name the radiations of electromagnetic spectrum which are used in stud...

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  15. Name the constituent radiation of e.m. spectrum which is used in satel...

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  16. Name the e.m. radiations used for studying crystal structure of solids...

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  17. Name the constituent radiation of e.m. spectrum which is absorbed from...

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  18. Name the constituent radiation of e.m. spectrum which produces intense...

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  19. Why are microwave used in Radar?

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  20. State the condition under which a microwave oven heats up food item co...

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