Question

very short answer questions
9. What is radiation? 10. Why do room heaters have polished reflectors? 11. Why do we use an umbrella on a hot sunny day?​

Answer 1

Answer:

9) Radiation is energy that comes from a source and travels through space at the speed of light. This energy has an electric field and a magnetic field associated with it, and has wave-like properties. You could also call radiation “electromagnetic waves”.

10)Room heaters have polished reflectors because bright,polished reflectors reflect heat more efficiently and hence more heat is generated in front of the heater,at the same time since they reflect heat the appliance or the unit is saved from getting heated or catching fire.

11)We use an umbrella to protect us from heat coming from the sun in the form of radiation.

Explanation:

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Answer 2

Answer:

9.Radiation is energy that moves from one place to another. Light, sound, heat, and X-rays are examples of radiation. The different kinds of radiation fall into a few general categories: electromagnetic radiation, mechanical radiation, nuclear radiation, and cosmic rays.

10.Room heaters have polished reflectors because bright ,polished reflectors reflect heat more efficiently and hence more heat is generated in front of the heater ,at the same time since they reflect heat the appliance or the unit is saved from getting heated or catching fire.

11.We use an umbrella to protect us from heat coming from the sun in the form of radiation.