Explanation

• The human ear can distinguish approximately 10 beats per second as separate beats.
• Persistence of hearing is approximately 0.1 seconds.

Last verified on 30-10-2026

Explanation

• In an isochoric process, the volume remains constant.
• Work done by a gas is calculated as W = PΔV.
• Since there is no change in volume (ΔV = 0), the work done is zero.

Last verified on 30-10-2026

Explanation

Total resistance = R + 2R + 3R = 6R

Current I = V / R_total = 24 / 6R = 4 / R

V1 = I _ R = 4/R _ R = 4V

V2 = I _ 2R = 4/R _ 2R = 8V

V3 = I _ 3R = 4/R _ 3R = 12V

Last verified on 30-10-2026

Explanation

By conservation of momentum: m1_v1 + m2_v2 = m1_v1' + m2_v2'

Take direction: Ball1 = +10 m/s, Ball2 = -4 m/s (towards each other)

2_10 + 4_(-4) = 2_v1' + 4_3

20 - 16 = 2_v1' + 12

4 = 2_v1' + 12

2*v1' = -8

v1' = -4 m/s

Magnitude is 4.0 m/s in opposite direction.

Last verified on 30-10-2026

Explanation

• Joining p-type and n-type semiconductor materials forms a PN junction.
• A PN junction is the basic structure of a semiconductor diode.
• A diode allows current to flow easily in one direction and restricts it in the opposite direction.

Last verified on 30-10-2026

Explanation

• When the temperature of a metallic conductor increases, its atoms vibrate more rapidly.
• These vibrations cause more frequent collisions between free electrons, decreasing their relaxation time.
• As relaxation time decreases, electrical resistance increases.

Last verified on 30-10-2026

Explanation

m = 800 kg

v = 54 km/h = 54 _ 1000 / 3600 = 15 m/s

d = 22.5 m

Work = Force x distance = Kinetic Energy

F = m_v^2 / 2_d

F = 800 _ 15^2 / 2 _ 22.5

F = 800 _ 225 / 45

F = 4000 N

Last verified on 30-10-2026

Explanation

Formula: Cmed = Er * Cvac

So Cvac / Cmed = 1 / Er

Last verified on 30-10-2026

Explanation

• Near the Earth's surface, acceleration due to gravity is approximately constant at 9.8 m/s².
• During free fall over a small height, the change in gravity is negligible.
• At very high altitudes, acceleration due to gravity decreases as the distance from Earth's centre increases.

Last verified on 30-10-2026

Explanation

• Infrared waves are used in night vision equipment.
• They detect heat emitted by objects.
• It allowing visibility in low-light conditions.

Last verified on 29-10-2026