Efficiency = (Work output / Heat input) × 100 = (300 J / 800 J) × 100 = 37.5%.

Efficiency = (Work done / Heat absorbed) * 100 = (200 J / 500 J) * 100 = 40%.

Efficiency = (Work output / Heat input) × 100 = (200 J / 600 J) × 100 = 33.33%.

The work done by a heat engine is equal to the heat absorbed from the hot reservoir minus the heat rejected to the cold reservoir.

Efficiency is calculated as (Output Power / Input Power) * 100%. Here, efficiency = (1800 W / 2000 W) * 100% = 90%.

Output power can be calculated using the formula: Output Power = Efficiency * Input Power. Here, Output Power = 0.8 * 500 W = 400 W.

The energy levels of a hydrogen atom are given by E_n = -13.6/n^2 eV, where n is the principal quantum number.

The energy of the electron in the ground state of a hydrogen atom is -13.6 eV.

The energy of an electron in a hydrogen atom in the n=2 state is given by E_n = -13.6/n^2 = -13.6/4 = -3.4 eV.

Using the Rydberg formula, the wavelength for the transition from n=3 to n=2 is approximately 486 nm.

The energy of the emitted photon is highest for the transition from n=2 to n=1, as it involves the largest energy difference.

The energy of the photon emitted is highest for the transition from n=2 to n=1, as it involves the largest energy difference.

The energy of the emitted photon is highest for the transition from n=2 to n=1, as it involves the largest energy difference.

Relative error = (Uncertainty / Measured value) * 100 = (0.05 / 1.2) * 100 = 4.17%.

Total uncertainty = (2 m/s) / 2 = ±1 m/s.

Percentage uncertainty = (absolute uncertainty / measured value) * 100 = (5 / 340) * 100 ≈ 1.47%.

The magnetic force on a charged particle is given by F = qvB sin(θ), which is maximum when θ = 90 degrees (perpendicular).

The magnetic force on a charged particle is zero when it moves parallel to the magnetic field, as the angle θ = 0° results in sin(θ) = 0.

Resistance R = ρ(L/A) = 2 x 10^-8 * (10 / (1 x 10^-6)) = 0.2 Ω.

The total strain energy stored in a volume V is given by the product of strain energy density U and volume V, i.e., Total Energy = U * V.

Stress = Young's modulus * strain = 200 GPa * 0.01 = 2 GPa = 2000 MPa.

Moving one of the mirrors changes the path length for one of the beams, causing a shift in the interference pattern.

Moving one mirror changes the path length of one beam, causing the fringes to move apart or closer depending on the direction of movement.

Moving one of the mirrors changes the path length of one beam, causing a shift in the interference pattern.

Moving one of the mirrors changes the path length, causing a shift in the interference pattern (fringes).

The RMS speed of a mixture of gases is the weighted average of the RMS speeds of the individual components, taking into account their molar masses.

The RMS speed of a mixture of gases is calculated using the average molar mass of the mixture in the formula v_rms = sqrt((3RT)/M_avg).

The spring in a moving coil galvanometer provides a restoring torque that returns the coil to its original position when the current is removed.

In nuclear reactions, both mass and charge are conserved, according to the law of conservation of mass-energy and charge.

The energy released when a nucleus is formed from its constituent nucleons is called binding energy.