Explanation

- At the midpoint, the electric fields due to each charge are equal in magnitude but opposite in direction, so they partially cancel out, making the net field weakest there.

Explanation

- Critical velocity is the maximum velocity at which fluid flows in laminar form.  

- Turbulent flow begins when the fluid exceeds this critical velocity.

Explanation

KE = ½ mv² = ½ × 0.5 × 6² = 0.25 × 36 = 9 J

Explanation

Constructive interference (max loudness) occurs when path difference = nλ  

(λ, 2λ, etc.)

Explanation

Gravitational force acts downward, so moving upward means work is done against gravity → negative work.

Explanation

Temperature coefficient α is defined as (Δρ / ρΔT)  

Unit = (Ω·m) / (Ω·m·°C) = 1/°C

Explanation

Given:  

- Percentage yield = 80%  

- Actual yield = 20 g  

Formula:  

% Yield = (Actual Yield / Theoretical Yield) × 100

Rearranging:  

Theoretical Yield = (Actual Yield × 100) / % Yield  

= (20 × 100) / 80 = 25 g

Explanation

Fe: [Ar] 3d⁶ 4s²  

Fe³⁺ → loses 3 electrons → 3d⁵  

5 electrons in 3d → all unpaired → 5 unpaired electrons

Explanation

ΔU = q + w = 100 + 40 = +140 kJ

Explanation

Hydrogen gas reacting with chlorine to form hydrogen chloride gas  

This involves electron transfer: H is oxidized (loses electrons), Cl is reduced (gains electrons) → a classic redox process.