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Prevention of Radioactive Pollution

A thermos fla...

Question

A thermos flask is polished well

A

To make attractive

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B

For shining

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C

To absorb all radiations from outside

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D

To reflect all radiations from outside

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Solution

The correct option is D
To reflect all radiations from outside

The polished surface reflects all the radiation.

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Similar questions

Q. In a thermos flask, there is a minimization of heat loss due to

(a) conduction
(b) convection
(c) radiation
(d) all of these

Q. A calorimeter is highly polished from inside and outside to prevent heat loss
by _________.

Q. A thermos flask prevents loss or gain of heat by

(a) conduction only
(b) convection only
(c) radiation only
(d) all of the above

Q. Radiation from the Sun reaching Earth (just outside the atmosphere) has an intensity of

1.4 {kW/m}^{2}

F_{R}

is the force on Earth due to radiation pressure and

F_{g}

is the force due to the Sun's gravitational attraction, then select the correct option.

(Assuming that Earth (and its atmosphere) behaves like a flat disk perpendicular to the Sun's rays and that all the incident energy is absorbed)

[Take R_{e a r t h} = 6400 km, M_{e a r t h} = 5.98 \times 10^{24} kg, M_{s u n} = 2 \times 10^{30} kg, Distance between the centers of Sun and Earth = 1.5 \times 10^{8} km]

Q. Explain how heat losses due to conduction, convection and radiation are minimized in a Thermos Flask .

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