Revision Notes For Class 10 Science Chapter 14 - Sources of Energy

Science and technology are constantly evolving, and over the centuries, man has discovered ways to harness various forms of energy. The very first source of energy to be harnessed was the wind. Ships with sails were the norm until the invention of steam-powered engines. And for the latter half of the 20th century, coal was still the most prevalent source of energy.

It was powerful and consistent, but it was inefficient and highly pollutive. Then by the mid 20th century, the power of the atom was harnessed and the era of nuclear energy began. Explore more about these sources of energy by referring Class 10 Revision Notes Science Chapter 14 – Sources of Energy, right here on BYJU’s.

Class 10 Science Chapter 14 - Sources of Energy
Class 10 Science Chapter 14 - Sources of Energy
Class 10 Science Chapter 14 - Sources of Energy
Class 10 Science Chapter 14 - Sources of Energy
Class 10 Science Chapter 14 - Sources of Energy
Class 10 Science Chapter 14 - Sources of Energy
Class 10 Science Chapter 14 - Sources of Energy
Class 10 Science Chapter 14 - Sources of Energy
Class 10 Science Chapter 14 - Sources of Energy
Class 10 Science Chapter 14 - Sources of Energy
Class 10 Science Chapter 14 - Sources of Energy
Class 10 Science Chapter 14 - Sources of Energy
Class 10 Science Chapter 14 - Sources of Energy

Further Reading


Practise This Question

The wave function, Ψn,l,ml is a methematical function whose value depends upon spherical polar coordinates (r, θ, Ф) of the electron and characterized by the quantum numbers n, l and m. Here r is distance from nucleus, θ is colatitude and Ф is azimuth. In the mathematical functions given in the Table, Z is atomic number and a0 is Bohr radius.
 

Column 1 Column 2 Column 3
(i) 1s orbital (i) Ψn,l,ml(Za0)32e(Zra0) (P)
(ii) 2s orbital (ii) One radial node (Q) Probability density at nucleus 1a30
(iii) 2 pz orbital (iii) Ψn,l,ml(Za0)52re(Zr2a0)cosθ (R) Probability density is maximum at nucleus
(iv) 3d2z orbital (iv) xy-plane is a nodal plane (S) Energy needed to excite electron from n = 2 state to n = 4 state is2732 times the energy needed to excite electron from n = 2 state to n = 6 state


For He+ion, the only INCORRECT combination is