Lumped heat transfer analysis of a solid object suddenly

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Lumped heat transfer analysis of a solid object suddenly exposed to a fluid medium at a different temp is valid when

1. Biot number < 0.1
2. Biot number > 0.1
3. Fourier number < 0.1
4. Fourier number > 0.1

Correct Option: A

For lumed system analysis, Bi < 0.1