Question

1. How is heat transferred by convection? Explain with the help of a diagram
2. How are sea and land breezes formed?
3. What is radiation? How does it affect an object?
4. How would you relate choice of colours to the radiation in day-to-day lif
5. Analyse the given diagrams:​

Answer 1

Answers....

1:

Convection occurs when particles with a lot of heat energy in a liquid or gas move and take the place of particles with less heat energy. Heat energy is transferred from hot places to cooler places by convection. Liquids and gases expand when they are heated. ... Convection currents can be seen in lava lamps.

2:

The wind will blow from the higher pressure over the water to lower pressure over the land causing the sea breeze. The sea breeze strength will vary depending on the temperature difference between the land and the ocean. At night, the roles reverse. The air over the ocean is now warmer than the air over the land.

3:

the emission of energy as electromagnetic waves or as moving subatomic particles, especially high-energy particles which cause ionization.

Exposure to very high levels of radiation, such as being close to an atomic blast, can cause acute health effects such as skin burns and acute radiation syndrome (“radiation sickness"). It can also result in long-term health effects such as cancer and cardiovascular disease.

Answer 2

Answer:

1. Explanation: convection is heat transfer by mass motion of a fluid such as air water when the heat fluid is caused to move away from the source of heat carrying energy with it.
2. The wind will blow from the higher pressure over the water to lower pressure over the land causing the sea breeze. The sea breeze strength will vary depending on the temperature difference between the land and the ocean. At night, the roles reverse. The air over the ocean is now warmer than the air over the land.
3. The main effect radiation has on matter is its ability to ionize atoms to become ions, a phenomenon known as ionization, which is very similar to the photoelectric effect. Radioactive particles or electromagnetic waves with sufficient energy collide with electrons on the atom to knock electrons off the atom.
4. Examples of Non-ionizing Radiation include: Visible light; Infrared light; Ultraviolet light; Microwaves; Radio waves; Low frequency electromagnetic waves, and examples of ionizing radiation include: Hard UV; X-rays; Gamma-rays; Cosmic rays; and Radioactive decay particles such as Alpha rays and Beta rays.