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KEAM Physics Flashcards
61 question-and-answer cards covering Physics as it is examined in KEAM. 24 of them are printed below, taken from across the deck — no signup, no paywall on the preview.
24 sample cards from the Physics deck
Sampled from the end of the deck, so these are different cards from the ones shown on the syllabus page.
Give the speed of a transverse wave on a string and the relation between v, f, and lambda.
v = sqrt(T/mu), where T is tension and mu is linear mass density. Wave relation: v = f lambda.
Distinguish transverse and longitudinal waves with examples.
Transverse: particle motion perpendicular to wave direction (e.g. waves on a string, light). Longitudinal: particle motion parallel to wave direction (e.g. sound in air).
State the conditions for resonance (fundamental frequency) in (a) a closed pipe and (b) an open pipe of length L.
Closed pipe (one end closed): f1 = v/(4L), only odd harmonics. Open pipe (both ends open): f1 = v/(2L), all harmonics present.
State the beat frequency and the Doppler effect formula for sound.
Beat frequency = |f1 - f2|. Doppler (general): f' = f (v +/- v_observer)/(v -/+ v_source), with signs chosen so approach raises the observed frequency.
State Coulomb's law and give the field of a point charge.
F = (1/(4 pi epsilon_0)) q1 q2 / r^2. Electric field of a point charge: E = (1/(4 pi epsilon_0)) q / r^2, directed radially.
State Gauss's law.
The net electric flux through a closed surface equals the enclosed charge divided by epsilon_0: flux = q_enclosed / epsilon_0.
Give the capacitance of a parallel-plate capacitor and the energy stored in a capacitor.
C = epsilon_0 A / d (x dielectric constant K with a dielectric). Energy U = (1/2) C V^2 = Q^2/(2C) = (1/2) Q V.
State Ohm's law and the formula for resistance in terms of resistivity.
V = IR (current proportional to voltage at constant temperature). Resistance R = rho L / A, where rho is resistivity.
State Kirchhoff's two circuit laws.
Junction (current) law: the sum of currents into a node equals the sum out (charge conservation). Loop (voltage) law: the sum of EMFs and potential drops around any closed loop is zero (energy conservation).
Give the formulas for resistors in series and in parallel.
Series: R = R1 + R2 + ... (same current). Parallel: 1/R = 1/R1 + 1/R2 + ... (same voltage).
State the Biot-Savart law and the force on a moving charge in a magnetic field.
Biot-Savart: dB = (mu_0/(4 pi)) I dl x r_hat / r^2. Force on a moving charge (Lorentz magnetic force): F = q v x B, magnitude qvB sin(theta).
Give the magnetic field at the centre of a circular loop and inside a long solenoid.
Centre of a circular loop: B = mu_0 I / (2R). Inside a long solenoid: B = mu_0 n I, where n is turns per unit length.
State Faraday's law and Lenz's law of electromagnetic induction.
Faraday: induced EMF = -d(flux)/dt; for N turns, EMF = -N d(flux)/dt. Lenz's law: the induced current opposes the change in flux that produces it (the minus sign), conserving energy.
Give the speed of light in terms of epsilon_0 and mu_0, and the order of the EM spectrum by increasing frequency.
c = 1/sqrt(mu_0 epsilon_0) = 3 x 10^8 m/s. Increasing frequency: radio < microwave < infrared < visible < ultraviolet < X-rays < gamma rays.
State the mirror/lens formula and the lens maker's formula.
Mirror/lens formula: 1/v - 1/u = 1/f (mirror: 1/v + 1/u = 1/f). Lens maker's: 1/f = (n - 1)(1/R1 - 1/R2). Power P = 1/f (in dioptres, f in metres).
State Snell's law and the condition for total internal reflection.
Snell's law: n1 sin(theta1) = n2 sin(theta2). Total internal reflection occurs when light goes from a denser to a rarer medium at an angle exceeding the critical angle theta_c, where sin(theta_c) = n_rarer/n_denser.
State the condition for fringe width in Young's double-slit experiment.
Fringe width beta = lambda D / d, where D is slit-to-screen distance and d is slit separation. Bright fringes: path difference = m lambda; dark fringes: (m + 1/2) lambda.
State the Einstein photoelectric equation and define work function.
K_max = h f - phi, where phi (work function) is the minimum energy to eject an electron. Below the threshold frequency f0 = phi/h, no emission occurs regardless of intensity.
Give the de Broglie wavelength of a particle.
lambda = h/p = h/(mv); for an electron accelerated through potential V, lambda ≈ 1.227/sqrt(V) nm.
Give the radius and energy of the nth Bohr orbit of hydrogen.
Energy E_n = -13.6/n^2 eV; radius r_n = 0.529 x n^2 angstrom (Bohr radius). Energy is negative, indicating a bound state.
Define mass defect and binding energy of a nucleus.
Mass defect = (sum of nucleon masses) - (actual nuclear mass). Binding energy = (mass defect) x c^2; higher binding energy per nucleon means a more stable nucleus (peak near iron-56).
State the law of radioactive decay and the relation between half-life and decay constant.
N = N0 e^(-lambda t); activity decreases exponentially. Half-life t_1/2 = ln(2)/lambda = 0.693/lambda; mean life tau = 1/lambda.
Compare intrinsic and extrinsic semiconductors (n-type and p-type).
Intrinsic: pure semiconductor, electrons = holes. n-type: doped with pentavalent (donor) impurity, electrons are majority carriers. p-type: doped with trivalent (acceptor) impurity, holes are majority carriers.
Explain the action of a p-n junction diode in forward and reverse bias, and the truth values of a NAND gate.
Forward bias (p to +): depletion region narrows, diode conducts. Reverse bias: depletion region widens, negligible current (until breakdown). NAND output is 0 only when both inputs are 1; otherwise output is 1.
What this deck covers
The Physics deck follows the KEAM Physics syllabus — 5 chapters and 24 topics — so questions land on material that is genuinely examinable rather than trivia around it. That works out to roughly 12.2 cards per chapter.
Answers are written to be recallable, not just readable — averaging about 148 characters, which is long enough to carry the reasoning and short enough to say out loud.
A deck like this earns its keep on the second and third pass. Read the syllabus first so you know the shape of the subject, then use the cards to find the specific facts that have not stuck.
Physics flashcards FAQ
How many Physics flashcards are in this KEAM deck?
61 cards. This page previews 24 of them, sampled evenly across the deck so you can judge the difficulty before installing anything.
Are these KEAM flashcards free?
Yes. The preview here is free to read with no signup, and the full 61-card deck is free inside the Examius app.
What do the Physics cards cover?
They follow the KEAM Physics syllabus — 5 chapters and 24 topics — so the questions track what is actually examinable.
How should I use these flashcards?
Read the syllabus first so you know the shape of the subject, then drill the deck. Examius schedules each card with spaced repetition, so cards you keep missing come back sooner and ones you know drift further apart.