The energy that is needed to make an electron jump from the valence band to the conduction band is called the âenergy gapâ. In a macroscopic piece of matter it is the equivalent of the excitation energy from the ground state to the first excited level in free atoms. Hope that was unerstandableâ¦.
He was created by A.A. Milne. The first collection of stories about the bear was the book Winnie-the-Pooh (1926) and this was followed by The House at Pooh Corner (1928). Milne also included a poem about the bear in When We Were Very Young (1924) and many more in Now We Are Six (1927).
Winnie-the-Pooh by A.A. Milne was my favorite book series as a child. Later, when my own kids sat listening to the adventures of Christopher Robin, Pooh Bear, Piglet, and Eeyore, and the gang, it was a little bit of a shock to discover this series, with its charming stories, are not just for kids.