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Why is a cathode ray tube evacuated to a...

Why is a cathode ray tube evacuated to a low pressure ?

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The correct Answer is:
`10^(-2), 10^(-3)mm Hg`
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ICSE-STRUCTURE OF ATOM-Very Short Answer Type Questions
  1. Name the scientist who indicated that the matter is electrical in natu...

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  2. Why is a cathode ray tube evacuated to a low pressure ?

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  3. What is the behaviour of cathode rays in the presence of an electric f...

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  4. What happens when cathode rays are passed through a gas?

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  5. Mention the charge, mass and e/m ratio for an electron.

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  6. What is the nature of charge on (i) cathode rays (ii) anode rays?

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  7. Among alpha, beta and gamma-rays, which is the most penetrating?

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  8. Who proposed the first model of atom?

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  9. Give a rough estimate of number of a particles which suffer a deflecti...

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  10. If the nucleus of an atom is magnified to the size of a football, how ...

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  11. Give the equation which had been instrumental in the discovery of neut...

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  12. How are the atomic number (Z) and mass number (A) related to each othe...

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  13. Do isobars possess similar chemical properties?

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  14. Why are the waves associated with light called electromagnetic waves?

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  15. Define wavelength and frequency of a wave.

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  16. Among X-rays and microwaves, which does possess a higher wavelength ra...

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  17. Give the wavelengths of D1 and D2 lines of sodium.

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  18. Which transitions are responsible for the occurrence of Brackett serie...

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  19. The Bohr model for the spectra of a H-atom

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  20. Should earth be regarded as a wave in the light of de-Broglie equation...

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