Question

(viii) The temperature of substance changes fro -20°C to 20 C. What is the temperature
change is kelvin's scale.
(a) 100k
(b) 40k (c)293k (d) None of these​

Answer 1

Answer:

c)293k

Explanation:

0°c=293k the temperature in Kelvin scale is 293k

Answer 2

Answer:

The right answer to the given question is an option(b):40k

Explanation:

• Celsius or centigrade scale is based on the freezing point and boiling point of the water i.e, 0° to 100°.
• Whereas the Kelvin scale has an absolute zero below which the temperature does not exist.
• To convert from Celsius to Kelvin scale, we need to add 273 to the Celsius scale.

Here,

The lower temp in Celsius = -20° C

Kelvin equivalent of -20°(k₁) = -20°+273

                                         =  253° K

The higher temp in Celsius = 20°

Kelvin equivalent of 20°(k₂) = 20°+273

                                        = 293° K

The temperature change in kelvin scale = k₂ - k₁

                                                                   = 293°K -273°K = 40°K

Thus, when the temperature of a substance changes from -20° C to 20° C, then in the kelvin scale change in temperature is 40°K.