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Topic 5:Energy; B
Transfer & Transformation of Energy; pgs (85-90)
| Question | Answer |
|---|---|
| What is the title of this Topic subsection? Page 85. | Transfer of Energy. |
| State the definition of a "source". | A region of high concentration of energy. Hot, high energy. |
| Define a "sink". | A region or location of low energy concentration. Cold, lower energy. |
| Describe "Dynamic Equilibrium". | Energy balance of inflow and reradiation resulting in no change in temperature. |
| What is an interface? (Digging Deeper, page 85.) | A boundary across which energy is transferred. |
| Can you name the three methods of energy transfer? | 1) Conduction, 2) Convection, & 3) Radiation. |
| Name the energy transfer method when heat is transferred via vibrating atoms in the solid physical phase state. | Conduction. |
| State the kind of electromagnetic radiation perceived by humans as "heat". *See Figure 5-3 | Infrared Radiation. |
| Convection currents in a liquid or gas are created how? | Density Differences. Hot rises, cold sinks. Wind or ocean currents are examples. |
| What is an open system? | Energy is gained from or lost to the external environment. |
| Explain a closed system. | No energy is lost or gained from the external environment. |
| Reviewing Figure 5-4, explain the role of Greenhouse gasses. | Greenhouse gasses absorb infrared radiation. Increased energy is manifested as higher temperature. We say that the air is "hot" if infrared a lot. |
| List two common Greenhouse gasses. | Carbon dioxide (CO2) & Vapor (H2O) g |
| Define radiation. | Energy transferred by electromagnetic waves. Method of energy transfer in space as no matter is required. |
| If an object emits little radiation, is it hot or cold? | Cold. |
| Which is hotter, 212 F.; 105 C.; or 300 K. ? | See page 13, ESRT. 105 C. radiates most infrared energy. Thus, is hottest. |
| Light is transferred by what method at all times through all environments? | Radiation. |
| Explain an energy transformation. | The changing of form of energy such as sunlight into plant life energy (photosynthesis). |
| Describe what friction is, and what form the transformed energy product takes. | Kinetic energy at an interface is transformed in to heat; such as a tire and a brake, or two hands rubbed together vigorously. |
| Define Kinetic Energy. | Energy of motion like a falling rock. |
| Define Potential Energy. | Stored Energy such as a new battery. |
| If a rock absorbs visible light from the Sun, are the reradiated waves longer or shorter? | Longer, lower energy, infrared radiation. |
| State the metric unit of energy or work. | A Joule. |
| Discuss Specific Heat. | The amount of energy required to raise the temperature of one gram of a substance, one degree Celsius. |
| Which common substance has the highest specific heat? *See ESRT pg 1! | Water at 4.18 Joules per gram per degree Celsius. |
| Which substance on the list, page 1 ESRT is heated most easily? | Lead. 0.13 Joules per gram per degree Celsius. |
| What word is used to describe the average kinetic energy of molecules? | Temperature. |
Created by:
whearn
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