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A small object is placed at the center of a large evacuated hollow spherical container. Assume that the container is maintained at 0K. At the time t=0 the temperature of the object is 200K. The temperature of the object becomes 100K at t-t, and 50K at t=t2. Assume the object and the container to be ideal black bodies. The heat capacity of the object does not depend on the temperature. The ratio t2/t1=?

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