Physics

The speed of light in a vacuum is approximately 299,792 kilometers per second (usually rounded to 3 x 10^8 m/s or 300,000 km/s). [Memory Trick: Imagine driving a car across the world '3 lakhs' (300,000) times in one eye-blink!]

Power is the rate at which work is done or energy is transferred, measured in Watts (Joules per second). [Memory Trick: Powerful people can pull a high-voltage bulb's 'Watt' to light up their ideas!]

Archimedes' Principle explains buoyancy and flotation. According to legend, Archimedes discovered this while taking a bath and ran naked shouting 'Eureka!'. [Memory Trick: 'Archimedes' took a dip in a tub, displacing water, and made 'floating' possible.]

Total Internal Reflection occurs when light traveling through a denser medium hits a boundary at an angle larger than the critical angle, bouncing entirely back inside. [Memory Trick: In fiber optics, light is locked in a 'Total' trap where it only 'Reflects' 'Internally'.]

Einstein won the Nobel Prize specifically for describing the photoelectric effect, showing light acts as packets of energy (photons), which laid foundations for quantum mechanics. [Memory Trick: Light hits a metal 'photo' plate to push out 'electrons' = 'Photoelectric' effect.]

Because Earth is an oblate spheroid (flattened at poles, bulging at equator), the poles are closer to Earth's center of mass, making gravity 'g' strongest there (~9.83 m/s²). [Memory Trick: North and South 'Poles' pull you down like heavy magnetic bars.]

Sound is a mechanical wave requiring a material medium (solid, liquid, or gas) to propagate through compression and rarefaction. It cannot travel through a vacuum. [Memory Trick: In space (a vacuum), nobody can hear you scream!]

Rayleigh scattering states that shorter wavelengths (blue/violet) of light scatter much more off small air molecules than longer wavelengths (red). [Memory Trick: 'Ray' (light) behaves in a lovely 'Rayleigh' blue style in the atmosphere.]

Resistance is measured in Ohms (denoted by Ω), named after German physicist Georg Simon Ohm. State relation: V = IR. [Memory Trick: In meditation, chanting 'Ohm' creates inner peace and 'resists' external distractions.]

French physicist Henri Becquerel discovered radioactivity in 1896 when he noticed uranium emission fogged photographic plates even in the dark. [Memory Trick: 'Becquerel' discovered radiation from 'uranium' like a 'baking' heater.]

Gamma rays have the highest energy, highest frequency, and shortest wavelengths in the EM spectrum, emitting from nuclear decay. [Memory Trick: Marvel's Hulk was hit by highly packed 'Gamma' rays which made him extremely powerful.]

A convex mirror diverges light rays and forms diminished, erect virtual images, allowing drivers to view a vast portion of traffic behind them. [Memory Trick: Convex curves out ('veX' looks like a shield), pushing a wide-angle view into your eyes.]

Absolute zero is defined as 0 Kelvin, which equates to exactly -273.15 °C on the Celsius scale. [Memory Trick: Thermometers freeze 'absolutely' down to '-273' below!]

Nuclear fusion is the process where light hydrogen atomic nuclei fuse under massive heat and gravity to form helium, releasing vast solar energy. [Memory Trick: 'Fu-sion' is 'Fusing' (combining) things together to make a giant sun.]

The escape velocity of any object from Earth's gravity is roughly 11.2 km/s (or about 25,000 mph). [Memory Trick: Imagine escaping in '1st' gear and hitting a speed of '1.2' sound speeds = 11.2 km/s!]

As speed increases, air resistance increases. When drag equals gravitational force, acceleration becomes zero, and the object falls at terminal velocity. [Memory Trick: The air acts like a 'braking' blanket = 'Air Resistance'.]

Centripetal force means 'center-seeking' force, which always acts perpendicular to velocity, directed towards the center of rotation. [Memory Trick: 'Centri-petal' -> 'Petal' falls inward to the 'Center' of the flower.]

P-type semiconductors are doped with trivalent impurities (like Boron), creating electron vacancies called 'holes' that act as positive charge carriers. [Memory Trick: 'P'-type stands for 'Positive', which are 'Holes' looking to receive negative electrons.]

LASER stands for 'Light Amplification by Stimulated Emission of Radiation'. It produces coherent, monochromatic, and collimated beam lasers. [Memory Trick: Photons are 'Stimulated' (excited) together to march in a straight laser line.]

The Meissner effect is a characteristic hallmark of superconductors. It expels magnetic flux, allowing magnets to float in mid-air above them (quantum levitation). [Memory Trick: Superconductor says 'Mind your business' and 'Messes up' (Meissner) the magnetic fields, ejecting them completely!]

Michael Faraday discovered electromagnetic induction, inventing the generator. This principle is used in transformers, generators, and induction hobs. [Memory Trick: 'Faraday' moved a magnet far 'away' and close to a coil to make current 'fare' (flow).]

The First Law of Thermodynamics states that heat added is equal to work done plus increase in internal energy ($Q = W + \Delta U$), keeping total energy conserved. [Memory Trick: Energy can change form, but never disappear. '1st' rule of cosmos = preserve energy.]

Surface tension is caused by cohesive forces between water molecules at the interface, forming an elastic-like membrane sheet. [Memory Trick: The 'Surface' of water stretches with 'Tension' like a trampoline for bugs.]

Bernoulli's principle states that an increase in fluid speed happens simultaneously with a decrease in pressure. Air travels faster over the curved wing top, creating lower pressure and upward lift. [Memory Trick: Burn a candle, blow air over it, the flame rises = 'Bernoulli' rises.]

Radiation is heat transfer via electromagnetic waves (like infrared), requiring no solid or fluid medium to travel. [Memory Trick: Solar rays 'radiate' directly through cosmic darkness to warm our skins.]