Question 1

In the hundred unit model if total reflection is thirty five and total longwave outgoing is sixty five what is total returned energy?

Accepted Answer

Hundred units Thirty five reflection and sixty five longwave outgoing together return hundred units. Remember the full outgoing sum in exams.

Question 2

Which statement shows the deepest understanding of the heat budget?

Accepted Answer

Earth reflects part of solar energy absorbs part and then balances absorbed energy through longwave emission and heat trans Heat budget is not just one number but a system of reflection absorption emission and transport. In exams understand the whole chain together.

Question 3

In the hundred unit heat budget model what do twenty seven units reflected by clouds show?

Accepted Answer

Clouds can return a large part of incoming energy to space Clouds reflect a significant part of solar radiation. Exam tip: treat clouds as a major reflector in the heat budget.

Question 4

If only two units of solar energy are reflected by Earth's surface what does it indicate?

Accepted Answer

Surface reflection is less than cloud reflection In the hundred unit model cloud reflection is greater than surface reflection. Exam tip: keep cloud albedo and surface albedo separate.

Question 5

Scattering and reflection of six units of energy by the atmosphere strengthens which process?

Accepted Answer

Reduced arrival of solar radiation at the surface Atmospheric particles can scatter solar energy and return some of it to space. Exam tip: connect scattering with incoming energy loss.

Question 6

If thirty five units out of one hundred return to space how many units are absorbed in the Earth atmosphere system?

Accepted Answer

Sixty five units If thirty five out of one hundred are reflected then sixty five units remain absorbed. Exam tip: subtract reflected energy to find absorbed energy.

Question 7

What is formed together by absorption of fourteen units by the atmosphere and fifty one units by the surface?

Accepted Answer

Total sixty five units absorbed energy Fourteen and fifty one together form sixty five units of absorbed energy. Exam tip: remember atmosphere plus surface absorption.

Question 8

After the surface absorbs fifty one units of energy by which path does that energy mainly return?

Accepted Answer

Through terrestrial longwave radiation and atmospheric processes The surface returns absorbed energy through longwave radiation and heat transfer. Exam tip: remember the output of surface absorption.

Question 9

Direct escape of seventeen units of terrestrial radiation to space is most closely linked with which concept?

Accepted Answer

Atmospheric window Some longwave radiation escapes directly to space through the atmospheric window. Exam tip: understand it as a direct escape path.

Question 10

Radiation of forty eight units of energy by the atmosphere to space proves which fact?

Accepted Answer

Atmosphere is also an emitter in the heat budget After absorbing energy the atmosphere can radiate it both to space and to the surface. Exam tip: treat atmosphere as an active emitter.

Question 11

Thirty five units of reflection and sixty five units of emitted energy together balance one hundred units. Which principle does this show?

Accepted Answer

Energy conservation and heat balance Incoming energy is finally balanced by reflection and emission. Exam tip: remember total incoming equals total outgoing.

Question 12

If absorbed energy at the surface increases but emission remains the same what happens to the local heat budget?

Accepted Answer

Energy surplus and warming tendency will develop More absorption with the same emission increases net energy. Exam tip: connect net gain with warming tendency.

Question 13

In which condition can the net radiation of a place become negative?

Accepted Answer

Outgoing energy is greater than incoming energy Negative net radiation shows a condition of energy loss. Exam tip: connect negative net radiation with cooling.

Question 14

Why does longwave radiation escape more effectively on a clear sky night?

Accepted Answer

The heat trapping cloud layer is weak Under a clear sky there is less counter radiation by clouds. Exam tip: connect clear night with rapid radiative cooling.

Question 15

If clouds remain high during both day and night what effect may occur on daily temperature range?

Accepted Answer

Day temperature may be lower and night temperature higher reducing range Clouds reflect by day and trap heat by night. Exam tip: connect cloud cover with reduced temperature range.

Question 16

Why can net radiation increase when albedo decreases?

Accepted Answer

Less energy is reflected and more energy is absorbed Low albedo allows the surface to retain more incoming energy. Exam tip: connect low albedo with high absorption.

Question 17

When snow cover decreases what type of feedback is possible in the polar heat budget?

Accepted Answer

Positive feedback because albedo decreases and absorption increases Less snow exposes darker surface and more heat is absorbed. Exam tip: remember ice albedo feedback in sequence.

Question 18

Greenhouse gases mainly affect which energy flow in the heat budget?

Accepted Answer

Longwave radiation emitted by Earth Greenhouse gases absorb and re-radiate longwave radiation. Exam tip: connect the greenhouse effect with outgoing radiation.

Question 19

If atmospheric water vapour is high why can night cooling become slower?

Accepted Answer

Water vapour absorbs longwave radiation Water vapour can trap heat like a greenhouse gas. Exam tip: connect humidity with heat retention.

Question 20

Closure of the atmospheric window may point toward which result?

Accepted Answer

Less direct escape of longwave energy If the window closes more longwave energy may remain in the atmosphere. Exam tip: treat the window as an outgoing path.

Question 21

In which condition can land surface heat faster than sea surface?

Accepted Answer

Due to lower heat capacity and less mixing Land has lower heat capacity and heat is mixed less deeply. Exam tip: remember land sea contrast.

Question 22

Why does the ocean heat budget help moderate climate?

Accepted Answer

Ocean gains and releases heat slowly High heat capacity of water slows temperature change. Exam tip: connect ocean moderation with heat capacity.

Question 23

What is the heat budget based reason for large diurnal range in deserts?

Accepted Answer

Low water vapour causes strong heating by day and strong radiative cooling at night Dry air and clear sky increase rapid movement of heat. Exam tip: connect desert range with dry clear conditions.

Question 24

How do concrete and asphalt change the heat budget in an urban heat island?

Accepted Answer

They cause more absorption and heat storage Paved surfaces show low albedo and high heat storage. Exam tip: connect urban heat island with surface material.

Question 25

Why can deforestation change the local heat budget in several ways at once?

Accepted Answer

Albedo moisture evapotranspiration and heat storage change Removal of forests changes surface and moisture based energy processes. Exam tip: connect deforestation with multiple energy fluxes.

The heat budget of the earth

Practice questions

01 In the hundred unit model if total reflection is thirty five and total longwave outgoing is sixty five what is total returned energy?

02 Which statement shows the deepest understanding of the heat budget?

03 In the hundred unit heat budget model what do twenty seven units reflected by clouds show?

04 If only two units of solar energy are reflected by Earth's surface what does it indicate?

05 Scattering and reflection of six units of energy by the atmosphere strengthens which process?

06 If thirty five units out of one hundred return to space how many units are absorbed in the Earth atmosphere system?

07 What is formed together by absorption of fourteen units by the atmosphere and fifty one units by the surface?

08 After the surface absorbs fifty one units of energy by which path does that energy mainly return?

09 Direct escape of seventeen units of terrestrial radiation to space is most closely linked with which concept?

10 Radiation of forty eight units of energy by the atmosphere to space proves which fact?

11 Thirty five units of reflection and sixty five units of emitted energy together balance one hundred units. Which principle does this show?

12 If absorbed energy at the surface increases but emission remains the same what happens to the local heat budget?

13 In which condition can the net radiation of a place become negative?

14 Why does longwave radiation escape more effectively on a clear sky night?

15 If clouds remain high during both day and night what effect may occur on daily temperature range?

16 Why can net radiation increase when albedo decreases?

17 When snow cover decreases what type of feedback is possible in the polar heat budget?

18 Greenhouse gases mainly affect which energy flow in the heat budget?

19 If atmospheric water vapour is high why can night cooling become slower?

20 Closure of the atmospheric window may point toward which result?

21 In which condition can land surface heat faster than sea surface?

22 Why does the ocean heat budget help moderate climate?

23 What is the heat budget based reason for large diurnal range in deserts?

24 How do concrete and asphalt change the heat budget in an urban heat island?

25 Why can deforestation change the local heat budget in several ways at once?

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