An iron rod has a length of 50m when the temperature is 20 C, By how much will it expand when the temperature rises to 30 C. Takeα=1.2 × 10-5k-1.

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myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.