Explanation

Amplitude ↑: More air energy → greater displacement of molecules.

Intensity ↑: Higher amplitude → louder sound (more energy).

Explanation

0°C → 4°C: Volume decreases as ice-like structure breaks, molecules pack closely → maximum density at 4°C.

4°C → 10°C: Volume increases as molecules move apart due to higher kinetic energy.

Explanation

In constructive interference, waves superpose in phase, so amplitudes add up.

As intensity ∝ (amplitude)², the resultant intensity becomes greater than the individual intensities.

Explanation

The motion of a free-falling object can be described by Newton's second law of motion,

force (F) = mass (m) times acceleration (a)

Newton's second law of motion states that F = ma, or net force is equal to mass times acceleration.

The other name for Newton's second law is the law of force and acceleration.

Explanation

Wave theory cannot explain why electrons are ejected instantly and depend on light frequency, not intensity.

It is explained only by particle (photon) nature of light.

Explanation

In Fraunhofer diffraction, the screen is placed far away (or lens used) so that incoming and outgoing waves are plane.

It is the most common type studied for single-slit and double-slit diffraction patterns.

Explanation

Explanation

A source of 1 kW power working for 1 hour does:

Work done = Power × Time = 1kW × 1hour = 1kWh

This is the standard unit of electrical energy.

Explanation

1 volt is defined as: 1V = 1J/1C

It means when 1 joule of work is done to move 1 coulomb of charge between two points, the potential difference is 1 volt.

Explanation

In circular motion, the inward (centripetal) force is: F = mv²/r

Hence, the force is directly proportional to the square of the speed of the stone.