*Physical constants CONSTANT SYMBOL VALUE IN SI UNITS DIMENSIONS Absolute zero K -273.15 K [K] Astronomical unit AU 1.5 x 10 11 m [L ] Atomic mass unit or unified mass u 1.66 x 10 – 27 kg [M ] Avogadro’s constant N0 6.023 x 10 23 moleucles/mol [mol– 1] Bohr magneton mB 1.41 x […]
Thermoelectric power The potential difference de across a piece of metal due to temperature difference dT is called the thermoelectric power or the Seebeck coefficient (S) of that material & is defined as, _ _ _ _ (1) Its units is V/K. Values in the hundreds of μV/K, negative or positive, are typical of good […]
*Quantities having same dimensions Momentum, impulse. [MLT – 1] Surface tension, spring constant. [MT – 2] Latent heat, gravitational potential. [L2 T – 2] Gravity, gravitational field intensity. [LT – 2] Angular momentum, Planck’s constant. [ML2 T – 1] Solar constant, pointing vector & wave intensity. [MT – 3] Frequency, angular frequency, velocity gradient, decay […]
Thermoelectric effect Consider an metal rod heated at one end & cooled at the other end as shown. The electrons in the hot region are more energetic and therefore have greater velocities than those in the cold region. Consequently there is a net diffusion of electrons from the hot end towards the cold end which […]
^Thermal properties of matter & thermodynamics
Facts If the liberated mass doesn’t react with electrodes, the electrode is called inert otherwise soluble. Cu – anode with any metallic cathode in Cu –voltameter forms inert electrode. Platinum electrodes in water voltameter, Platinum anode in Cu – voltameter are the examples of inert electrodes. During electrolysis mass of cathode increases, (Reduction takes place […]
Faraday laws of electrolysis 1st law: m ∝ q or m = z I t 2nd law: m ∝ E for constant q
^Shm & waves
*Bulk properties of matter
^Rotational motion
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