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MHT CET202314 May 2023Evening ShiftPhysicsThermal Properties of MatterActual

A metal rod cools at the rate of 4 ^ C / min when its temperature is 90^ C and the rate of 1 ^ C / min when its temperature is 30^ C . The temperature of the surrounding is

Options

  1. A20^ C
  2. B15^ C
  3. C10^ C
  4. D5^ C

Correct answer

C. 10^ C

Step-by-step solution

According to Newton's law of cooling, array ll & R ₁ R ₂ = ₁- ₀ ₂- ₀ & 4 1 = 90- ₀ 30- ₀ & 120-90=4 ₀- ₀ & 3 ₀=30 array Temperature of the surroundings is, ₀=10^ C

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