15. Give the values of maximum and minimum focal length of eye lens ?
16. Which rule provides the information that maximum number of elec-
trons filled in an orbital is 2.
17. What is Newland law of octaves ?
18. Draw electron dot structure for Ne.
19. Why do tungsten is used in filament ?
20. What is corrosion ?
Answers
Answer:
25cm and infinity dot the first
Answer:
15. The maximum focal length of eye lens is 2.5 cm. The distance between lens and retina is 2.5cm. Minimum focal length occur when you focus on images at your nearpoint The minimum focal length of eye lens is 2.27 cm.
16. The Pauli exclusion principle says that no two electrons can have the same set of quantum numbers; that is, no two electrons can be in the same state. This exclusion limits the number of electrons in atomic shells and subshells.
17. Law of octaves, in chemistry, the generalization made by the English chemist J.A.R. ... Newlands in 1865 that, if the chemical elements are arranged according to increasing atomic weight, those with similar physical and chemical properties occur after each interval of seven elements.
18. ..
: NE :
..
19. Tungsten is used for making filament of an electric bulb due to the following reasons: Being an alloy it has a very high melting point. It has very high resistivity so it does not burn easily at room temperature. The lamp glows at high temperatures.
20.Corrosion is a natural process that converts a refined metal into a more chemically stable form such as oxide, hydroxide, carbonate or sulfide. It is the gradual destruction of materials by chemical and/or electrochemical reaction with their environment.
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