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1^(st) excitation Potential of a hydrogen like sample is 15 volt. If all the atoms of the sample are in 2^(nd) excited state then find the K.E. in eV of the electron ejected if a photon of energy (65)/(9)eV is supplied to this sample.

Savitri had to make a model of a cylindrical kaleidoscope for her science project. She wanted to use chart paper to make the curved surface of the kaleidoscope. (see Fig 13.10). What would be the area of chart paper required by her, if she wanted to make a kaleidoscope of length 25cm with a 3.5cm radius?

Savitri had t o make a model of a cylindrical Kaleidoscope for her science project. She wanted to use chart paper to make the curved surface of the Kaleidoscope. What should be the area of chart paper required by her, if she wanted to make a Kaleidoscope of length 25 cm with a 3.5 cm radius?