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Composition of Air

Exhaled air f...

Question

Exhaled air forms a moisture film on objects like spectacles and glass, why?

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Solution

Warmer air that is exhaled when comes in contact with cooler surfaces it condenses on the surface and forms a moisture film.

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Q. Which of the following reactions of potassium super oxide supply oxygen gas in the breathing equipments used in space and submarines ?
(1) Reaction of superoxide with nitrogen in the exhaled air.
(2) Reaction of superoxide with moisture in the exhaled air.
(3) Reaction of superoxide with carbon dioxide in the exhaled air

To clean their spectacles, people often breathe out on glasses to make them wet. Explain why the glasses become wet.

Q. To clean their spectacles, often breathe out on glasses to make them wet. Explain why the glasses become wet?

Question 6

To clean their spectacles, people often breathe out on glasses to make them wet. Explain why the glasses become wet.

2.4 m

in front of a lens forms a sharp image on a film

12 c m

behind the lens. A glass plate

1 c m

thick of refractive index

1.50

is interposed between lens and film with its plane faces parallel to film. At what distance (from lens) should object be shifted to be in sharp focus on film?

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