Question

ANSWER THE FOLLOWING:

1. Convert 298 K to °F.

2. i. Define one calorie.
ii. 1 J = _______ cal.

3. Cooking utensils are provided with ebonite handle. Explain.

4. What do you observe when two thermometers, one with a shining bulb and another one with a blackened bulb is kept in sunlight? Explain your observation.

I will mark the first answer, if correct, as Brainliest.



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Answer 1

Answer:

1. Convert 298 K to °F.

=by subtracting 273

so it will be 25°C

now the formula

F =C×9/5+32

45+32=77F

3. Cooking utensils are provided with ebonite handle. Explain.

=Cooking utensils are provided with handles of bad conductors of heat such as ebonite or wood to hold them as the handles of these materials do not allow heat to pass from utensil to our hand.

Answer 2

Convert 298 K to °F.

=by subtracting 273

so it will be 25°C

now the formula

F =C×9/5+32

45+32=77F

2 (i) 4184 joules

(ii) 0.000239 kilocalorie

3. =Cooking utensils are provided with ebonite handles which are bad Conductor of heat. Ebonite handles don't allow electricity to pass to any medium. This is the reason why cooking utensils are provided with ebonite handles.

4= When we placed two concave mirrors of tin, of nine inches focus, at the distance of twelve feet we observe, that a thermometer with its bulb blackened stands higher than one which has shining bulb.