Explanation

• Quantum theory states that energy is emitted and absorbed in fixed small packets called quanta.
• These packets are not continuous but exist in discrete amounts.
• This concept was introduced by Max Planck.

Last verified on 13-05-2026

Explanation

• In the photoelectric effect, electrons are emitted only when the frequency of incident light reaches a minimum threshold value.
• This minimum frequency is called the threshold frequency.
• Below this value, no electrons are emitted regardless of light intensity.
• This phenomenon was explained by Albert Einstein.

Last verified on 13-05-2026

Explanation

• Spring tides occur when the Sun, Earth, and Moon are aligned in a straight line.
• Their gravitational forces combine and produce very high and very low tides.
• These tides happen during full moon and new moon.
• They are the strongest type of tides.

Last verified on 13-05-2026

Explanation

• Laser light is highly concentrated in a very narrow beam.
• This allows it to deliver a large amount of energy to a very small area.
• It does not spread out like normal light.
• This property makes lasers useful in medicine, industry, and communication.

Last verified on 13-05-2026

Explanation

• Alpha radiation has the lowest penetrating power.
• It can be stopped easily by paper or even human skin.
• Alpha particles are heavy and carry a positive charge.

Additional information:

• Gamma rays have the highest penetrating power.

Last verified on 13-05-2026