Physics
What do you mean by degradation of energy? Explain it by taking two examples of your daily life.
Answer
The gradual decrease of useful energy due to radiation loss, friction, etc. is called degradation of energy.
Examples of degradation of energy —
- In transmission of electricity from a power generating station, a lot of electrical energy is wasted in the form of heat energy in the line wires used for transmission.
- When we cook food over a fire, the major part of heat energy obtained from the fuel is radiated out in the atmosphere. This radiated energy is of no use to us. It is thus a degraded form of energy.
Related Questions
What technological measures are necessary to minimise the impact of global warming
What policy measures should the government enforce in order to minimise global warming ?
Assertion (A) : Fishes survive in ponds even when the atmospheric temperature is below 0°C.
Reason (R) : The anomalous expansion of water helps in preserving aquatic life.
- both A and R are true and R is the correct explanation of A
- both A and R are true and R is not the correct explanation of A
- assertion is false but reason is true
- assertion is true but reason is false
A scientific research team records temperature data of a freshwater lake in the Himalayas during winter. Three thermometers A, B, and C are used, where A is calibrated in the Celsius scale, B in the Fahrenheit scale, and C in the Kelvin scale.
On a particular night, when the surface water of the lake freezes, the recorded temperatures are :
A ⟶ 0 °C, B ⟶ 32 °F, C ⟶ 273 K
Next morning, the air temperature increases slightly, but the ice on the surface of the lake does not melt immediately.
(a) What happens to the fish present in the lake when the surface of the lake freezes?
(b) If the temperature of water at the bottom of the lake is measured, what would be the readings on thermometers A, B, and C?
(c) Why does the ice formed on the surface of the lake not sink?
(d) Why does the ice on the lake take time to melt even after the air temperature rises above 0 °C?
(e) Why is the Kelvin scale preferred in scientific calculations related to heat transfer?