Lakhmir Singh & Manjit Kaur - Physics

Book: Lakhmir Singh & Manjit Kaur - Physics

Chapter: 3. Sources of Energy

Subject: Physics - Class 10th

Q. No. 13 of Very Short Answer Type Questions-Pg-140

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13

How much solar energy will be received by 1 m2 area in one hour if the solar constant be 1.4 kW/m2?

From the solar constant we deduce that

1.4 kW of power is incident upon every 1m2 of area.


i.e the total energy incident in 1 hr over an area of 1 m2 will be = 1.4 kW x 1 hr


(Since P=E/t or E=P x t)


Hence, energy = 1.4 kWh


Solar energy received by 1 m2 area in one hour (or 3600 s) = 1.4 x 3600 = 5040 kJ


Chapter Exercises

Very Short Answer Type Questions-Pg-121
Very Short Answer Type Questions-Pg-130
Very Short Answer Type Questions-Pg-140
Very Short Answer Type Questions-Pg-148
Very Short Answer Type Questions-Pg-156
Very Short Answer Type Questions-Pg-161
Short Answer Type Questions-Pg-122
Short Answer Type Questions-Pg-131
Short Answer Type Questions-Pg-140
Short Answer Type Questions-Pg-148
Short Answer Type Questions-Pg-157
Short Answer Type Questions-Pg-161
Questions Based on High Order Thinking Skills (HOTS)-Pg-123
Questions Based on High Order Thinking Skills (HOTS)-Pg-132
Questions Based on High Order Thinking Skills (HOTS)-Pg-142
Questions Based on High Order Thinking Skills (HOTS)-Pg-150
Questions Based on High Order Thinking Skills (HOTS)-Pg-159
Long Answer Type Questions-Pg-122
Long Answer Type Questions-Pg-131
Long Answer Type Questions-Pg-141
Long Answer Type Questions-Pg-149
Long Answer Type Questions-Pg-157
Multiple Choice Questions (MCQs)-Pg-122
Multiple Choice Questions (MCQs)-Pg-131
Multiple Choice Questions (MCQs)-Pg-141
Multiple Choice Questions (MCQs)-Pg-149
Multiple Choice Questions (MCQs)-Pg-158
Multiple Choice Questions (MCQs)-Pg-161

More Exercise Questions

1

A hydro-power plant converts one from of energy into another. Name the two forms of energy.
2

What type of energy is possessed by flowing water?
3

Flowing water can rotate a turbine. Which type of energy is used up by the turbine?
4

Name the original source of wind energy.
5

What should be the minimum wind speed for the satisfactory working of a wind- powered electric generator?
6

Write one use of wind energy

(a) In the past


(b) At present.
7

Why is the copper tube of a solar water heater painted black from outside?
8

What type of reactions occurring inside the sun produces solar energy?
9

Name some of the solar energy devices.
10

What type of reflector is used in a box-type solar cooker?
11

What is the range of temperature which can be achieved in a box-type solarcooker in two to three hours?
12

Name the devices which converts sunlight into electricity.
13

How much solar energy will be received by 1 m2 area in one hour if the solar constant be 1.4 kW/m2?
14

Fill in the following blanks with suitable words :

A solar cell converts …………………. energy into …………………. energy.

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