Energy Sources

Question 1

What is a San key diagram?

Answer 1

Type of energy diagram that represents energy transfers. Each arrow is proportional to the amount of energy in that section.

Question 2

What is P?

Answer 2

Radiated power

Question 3

What is i?

Answer 3

i = intensity

Question 4

What is A?

Answer 4

A = area

Question 5

What is the formula for intensity?

Answer 5

I = P/A

Question 6

What is λmax?

Answer 6

The wavelength at which the intensity is maximum

Question 7

What is T (Wien’s Law)?

Answer 7

Absolute temperature

Question 8

What is b?

Answer 8

Wien’s constant (2.9 * 10^-3 mK)

Question 9

What is the formula for Wien’s displacement law?

Answer 9

λmax = b/T

Question 10

What is P (sb law)?

Answer 10

Radiated power

Question 11

What is e (sb law)?

Answer 11

Emissivity of the object ( e=1 for ideal radiator)

Question 12

What is σ (SB law)?

Answer 12

Stefan’s constant (5.6703 * 10^-8)

Question 13

What is A (SB law)?

Answer 13

Radiating Area

Question 14

What is T (SB law)?

Answer 14

Temperature of radiator

Question 15

What is Tc (SB law)?

Answer 15

Temperature of surroundings

Question 16

What is the Stefan-Boltzmann Law?

Answer 16

P = eσA(T^4 - Tc^4)

Question 17

Formula for Emmisivity?

Answer 17

e = power emitted by a radiating object / power emitted by a black-body with the same proportions at the same temperature

Question 18

What is albedo (a)?

Answer 18

How much of total energy incident on surface is reflected

Question 19

What is the formula for albedo (between 0 and 1)?

Answer 19

A = energy reflected by the surface / total energy incident on surface