Correct Answer - Option 2 : 20
Concept:
Temperature
- The degree of hotness or coldness of a body is given by the temperature.
- The heat is transferred from a hotter body to a colder body until the temperature of both comes to an equilibrium.
- The SI unit of temperature is Kelvin (K).
- Degree centigrade is another unit of measuring temperature which is based on the freezing and boiling point of water.
- 0° C is the freezing point, and 100° C is the boiling point of the water.
- Kelvin is used for scientific measurements.
- 0 Kelvin is said to be absolute temperature. The temperature below this cannot be achieved.
- The relationship between Kelvin and ° C is given as K = C + 273
Explanation:
So, the relationship between Kelvin and ° C is
K = C + 273
We need to add 273 in ° C to obtain the value of temperature in Kelvin.
Now, the difference between the two temperatures in Kelvin will be the same as that of ° C.
For example, we have to find the difference in temperature between 30 °C and 50 °C
In Kelvin, we have to find the difference between (30 + 273) and (50 + 273) K
Lets find difference in Kelvin
(50 + 273) K - (30 + 273) K = 50K + 273 K - 30 K - 273 K = 20 K
So the difference in two temperature is 20 K (273 gets cancelled in above expression)
This also difference is °C (50 ° C - 30 °C ) = 20 ° C
So, correct option is 20.
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Fahrenheit: The Fahrenheit scale was proposed by physicist Daniel Gabriel Fahrenheit in 1724.
- This scale is primarily used in the United States and some Caribbean countries to communicate day to day temperatures.
The temperature T in degrees Fahrenheit (°F) is equal to the temperature T in degrees Celsius (°C) times 9/5 plus 32:
\(°F={{9\over5}°C+32}\)
