Using polychromatic light results in overlapping patterns of different wavelengths, causing the overall pattern to become broader.

Moving the screen further away increases the fringe separation, as fringe width β = λD/d; increasing D increases β.

Fringe width (β) is given by β = λD/d. If λ is halved, β will also be halved.

Using the first-order rate equation, k = (ln[A₀] - ln[A]) / t. Here, k = (ln(0.8) - ln(0.2)) / 20 = 0.0347 min⁻¹.

In a first-order reaction, the half-life is constant, which indicates that the rate constant remains constant.

t₁/₂ = 0.693 / k = 0.693 / 0.03 = 23.1 min.

In a fluid at rest, the pressure at a point depends on the depth of the fluid above that point.

In a fluid at rest, the pressure at a point depends on the height of the fluid column above it, as described by hydrostatic pressure.

Laminar flow refers to fluid motion in parallel layers with no disruption between them.

In a fluid, pressure increases with depth due to the weight of the fluid above.

Hydrostatic head is the height of a fluid column that exerts a certain pressure, calculated as pressure divided by the density and gravitational acceleration.

Surface tension is the property of a fluid that causes its surface to behave like a stretched elastic membrane.

A rabbit is a primary consumer as it feeds on plants (producers).

The correct order of energy flow in a food chain is Producer → Consumer → Decomposer.

Primary producers are organisms that produce their own food, primarily plants through photosynthesis.

The cathode reaction must be a reduction reaction, and Cu²⁺ + 2e⁻ → Cu is a common cathode reaction.

The cathode reaction is O₂ + 4e⁻ + 4H⁺ → 2H₂O.

The cathode reaction must be a reduction; Ag⁺ + e⁻ → Ag is the anode reaction.

The cathode reaction is Cu²⁺ + 2e⁻ → Cu.

The probability of losing is 1 - 0.2 = 0.8.

In a generator, mechanical energy is converted into electrical energy through the process of electromagnetic induction.

In a generator, mechanical energy is converted into electrical energy through the process of electromagnetic induction.

In a generator, the rotating coil induces EMF by changing the magnetic flux through it.

Number of non-smokers = 50 - 20 = 30. Probability = 30/50 = 3/5.

There are 50 - 20 = 30 non-smokers. The probability is 30/50 = 3/5.

Frequency (f) = (1/2π)√(k/m). If mass (m) is doubled, frequency decreases.

Efficiency (η) = Work done / Input heat = 300 J / 500 J = 0.6 or 60%.

In a hexagonal close-packed (HCP) structure, there are 6 atoms per unit cell.

In a hexagonal close-packed (HCP) structure, the coordination number is 12, as each atom is in contact with 12 others.

Probability = Number of winning tickets / Total tickets = 2/10 = 1/5.