Heat Transfer

Question 1

relation between linear,areal,volume expansion constant∝

Answer 1

Linear expansion constant:- ∝

Areal expansion constant:- 2∝

Volume expansion constant:- 3∝

Question 2

stress formula

Answer 2

stress= Force/Area

Question 3

if temperature increases, Time period of the pendulum clock decreases/increases and the clock runs faster/slower, and hence gains/loses time

Answer 3

if temperature increases, Time period of the pendulum clock increases and the clock runs slower, and hence loses time

Question 4

if temperature decreases, Time period of the pendulum clock decreases/increases and the clock runs faster/slower, and hence gains/loses time

Answer 4

if temperature decreases, Time period of the pendulum clock decreases and the clock runs faster, and hence gains time

Question 5

latent heat of ice to water

Answer 5

80 cal per gram

Question 6

latend heat of water to steam

Answer 6

540 cal per gram

Question 7

principle of calorimeter for two objects in contact and conducting heat and achieve a common temperature

Answer 7

m1 S1 (T1-T) = m2 S2 (T-T2)

Question 8

heat capacity of water and ice

Answer 8

heat cacpacity of water = 1 cal per cram celcius

heat cacpacity of ice= 0.5 cal per cram celcius

Question 9

whats the faster mose of heat transfer

Answer 9

radiation

Question 10

rateflow of heat through ever crss section remains constant/changes

Answer 10

constant

Question 11

rate of flow of heat

Answer 11

H = d

Question 12

comparing V , I , R to the heat conduction sytem! whats what?

Answer 12

I = H(rate of flow of heat)

V= (T2-T1) (Change in temperature)

R= L/KA

Question 13

thickness of ice formed on the lake formula

Answer 13

Question 14

black body need not be black in color! true or false

Answer 14

true

Question 15

can a black body five maximum radiation at many temperature?

Answer 15

no it gives max radiation at only a particular temperature

Question 16

stefans law( power radiated by a body)

Answer 16

Question 17

rate of colling derived from stefans law

Answer 17

Question 18

newton’s law of cooling

Answer 18

θ_s represent the temperature of the surrounding

θ_b represents the temperature of body

Question 19

weins displacement law

list the main formula, draw the of T and λ and what does the area under that graph represents

Answer 19

the area under the graph represents the total intensity at that temperature

Question 20

intensity formula with power,area or work done, time duration, area

Answer 20

Intensity= P/A

Intensity= Q/At