planck s constant

where 'h' is proportionality constant, universally referred to as Planck's constant. It has a fixed value of: h = 6.63 x 10 3 4 joule.sec or h = 3.99 x 10 - 1 3 kJ sec mol - 1 . This relation was found to be valid for all types of electromagnetic radiation. The total a..

The solar constant is defined as the amount of heat energy received per second per unit area by a perfect black body placed at the surface of the Earth with its surface being held perpendicular to the direction of the sun's rays. The value of solar constant is 1388 Wm - 2 or 2 c..

E.g., gravitational constant (G), Planck's constant (h) and velocity of light (c) Their values are always constant..

For heterogeneous reactions, the concentration terms for pure solids and pure liquids are not included in the expression for equilibrium constant. The concentration of pure solids and liquids remain constant, and these terms are merged into the equilibrium constant or ..

Equilibrium Constant (K c ) From Nernst Equation - In the following cell, Zn (s)| ZnSO 4 (aq) || CuSO 4 (aq) |Cu(s) Electrons flow from the Zn to the Cu rod. 1) Zn from the Zn rod dissolves as Zn 2 + 2) Cu 2 + from CuSO 4 deposits on the Cu plate. The concentration of ..

The volume of a metallic hollow sphere is constant. Its outer radius is increasing at the rate of 2 cm/s. Find the rate at which its inner radius is increasing if the outer and inner radius of the sphere are 16 cm and 8 cm respectively. => 8 cm/s or 6 cm/s or..

Write a sentence that expresses the relationship in the formula S = 4 π r 2 , where S and r are the surface area and radius of a sphere and 4 π is the constant of variation. => The surface area of a sphere varies as the cube root of its radius or The surface area..

The velocity of a particle is related with its displacement S as V 2 = 9S 2 + 5 k S + k 2 where k is a constant. What is the acceleration of the particle when it is α units away from the starting point? => α units or 9 k units or ( α - 9 k )..

Galileo Galilee (1564-1642), a great Italian scientist raised a number of questions about the action of forces on a body with respect to the motion of the body. He performed various experiments and answered those questions by studying the results of his experiments. Aristotle, a Greek philosop..

A car is traveling from city X to city Y at a constant speed of 41 miles per hours. The distance between these two cities is 246 miles. Using the formula s = d t , find the time taken by the car to go from city X to city Y (where s is the speed of the car, d is the dis..