DPP

DPP – 9S72 MOTION

DPP – 9S72 MOTION     1. Starting from a stationary position, Rahul paddles his bicycle to attain a velocity of 6 m s–1 in 30 s. Then he applies brakes such that the velocity of the bicycle comes down to 4 m s-1 in the next 5 s. Calculate the acceleration of the bicycle in both

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DPP – 9S21

DPP – 9S21 IS MATTER AROUND US PURE?   Q1. Difference between pure and impure, element and compound, compound and mixture?   Q2. Which of the following materials fall into the category of “pure substance”?   (a) Ice (b) Milk (c) Iron (d) Hydrochloric acid (e) Calcium oxide (f) Mercury (g) Brick (e) Wood (f)

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DPP – 11C25 Bohr’s Model

DPP – 11C25 Bohr’s Model   Q1. Calculate energy of electron in 2nd orbit of He+ also calculate the radius. (Ans: 𝐸2  = –2.18 × 10−18 J/atom, 𝑟2 = 105.8 pm)   Q2. Calculate the energy required to remove an electron from 2nd orbit to 4m orbit also calculate the wavelength associated with it. (Ans: △E =

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