Explanation

• Energy is not continuous; it exists in small packets.
• These packets are called quanta (singular: quantum).
• Light energy is carried in quanta called photons.
• This idea is part of quantum theory.
• It explains atomic and subatomic behavior of energy.

Last verified on 24-05-2026

Explanation

• Threshold frequency is a concept of the photoelectric effect.
• It is the minimum frequency of light needed to remove electrons from a metal surface.
• Below this frequency, no electrons are emitted.
• Different metals have different threshold frequencies.
• This concept was explained by Albert Einstein in 1905.

Last verified on 24-05-2026

Explanation

• Tidal forces are mainly caused by the Moon’s gravitational pull.
• The Moon attracts Earth’s oceans, creating high and low tides.
• The Sun also affects tides but less than the Moon.
• Tides occur regularly due to Earth-Moon interaction.
• Coastal areas experience noticeable tidal changes daily.

Last verified on 24-05-2026

Explanation

• Laser beams produce highly focused light.
• They allow accurate reading of barcode lines.
• Precision helps in fast and error-free scanning.
• Laser light does not spread much like normal light.
• This improves efficiency in retail and data systems.

Last verified on 24-05-2026

Explanation

• Gamma rays have the highest penetrating power among these particles.
• Due to their lack of mass and charge.
• It allowing them to pass through most materials.

Additional information:

• Alpha radiation has the lowest penetrating power.

Last verified on 12-04-2026