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- class 11 to study the relationship between the temperature of a hot body and time by plotting a cooling curve viva questions
Physics Practical Class 11 To study the relationship between the temperature of a hot body and time by plotting a cooling curve. Viva Questions with Answers
1) Which is the fastest mode of heat transfer?
Radiation is the quickest mode of heat transfer because it travels at the speed of light. The slowest mode of heat transmission is conduction because it takes place from particle to particle.
2) Name the law that governs the phenomenon of thermal radiation.
Stefan-Boltzmann Law rules the phenomenon of thermal radiation. This law states that the fourth power of the absolute temperature of a surface is proportional to the total radiant heat power emitted from that surface.
3) Thermal energy is converted to which form of energy in thermal radiation?
Due to the thermal motion of the particles in the substance, the thermal energy is converted to electromagnetic energy. A substance emits thermal radiation if its temperature is more significant than absolute zero. The motion of the particles causes the acceleration of charge, and hence electromagnetic energy is produced due to the dipole oscillation of these accelerating charges.
4) Can you prevent radiation using a good insulator?
Yes, we can prevent heat radiation using shiny or reflective material that reflects heat from the radiation from inside and outside material or object. For example, a thermos bottle is coated with shiny material and a lining to prevent heat conduction.
5) What is Newton’s Law of Cooling?
The difference in the body’s temperature and its surroundings is directly proportional to the rate of heat loss from a body. This is known as Newton’s law of cooling.
6) We can use Newton’s law of cooling on a body that is kept in a room containing air at 30°C, and the body’s temperature is 300°C. Is it true or false?
The given statement is false because Newton’s law of cooling can only be applicable when there is a small temperature difference.
7) What is heat transfer?
To study the transmission of energy from a high-temperature reservoir to a low-temperature reservoir, the phenomenon of heat transfer was introduced from the branch of thermal engineering.
8) According to which law the transfer of heat takes place?
According to the second law of thermodynamics, the thermal energy per unit temperature that is inaccessible for doing useful work (the total entropy of an isolated system) can never decrease. Hence, the second law of thermodynamics explains the heat transfer process.
9) The amount of heat received by the body when heat is radiated from a hot source, depends on the nature of the body. Is it true or false?
Yes, it is true because radiation is the phenomenon in which heat transmission takes place by electromagnetic waves. For example, a black body, as compared to any other body, will absorb more energy from the same source.
10) Using which phenomenon, the walls inside deep freezers absorb heat from food materials and keep them cool.
The walls absorb heat by radiation inside deep freezers from food materials and keep them cool.
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Heat Transfer Questions and Answers – Stefan- Boltzman Law
This set of Heat Transfer Multiple Choice Questions & Answers (MCQs) focuses on “Stefan- Boltzman Law”.
3. Calculate the radiant flux density from a black surface at 400 degree Celsius? a) 1631.7 W/m 2 b) 31.7 W/m 2 c) 631.7 W/m 2 d) 11631.7 W/m 2 View Answer Answer: d Explanation: E = σ T 4 = 5.67 * 10 – 8 (400 + 273) 4 = 11631.7 W/m 2 .
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To verify the Stefan’s law by Electrical method – Physics Practical
Stefan’s law states that the energy radiated per second by unit area of a black body at thermodynamic temperature T is directly proportional to T 4 . The constant of proportionality is the Stefan constant, equal to 5.670400 × 10 –8 Wm –2 K –4 . This practical will verify this law using electrical method.
Practical of verification of Stefan’s law
Watch this Video to know about Stefan’s Law
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All Lab Experiments
To Determine the Value of Stefan’s Constant
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Experiment File in pdf format
Find more Thermal Physics Practical Files on this Link – https://alllabexperiments.com/phy_pract_files/thermal/
Watch Stefan’s Constant Experiment Video on YouTube – https://www.youtube.com/watch?v=U5sdiQSjyHA
Watch Stefan’s Constant Viva-Voce Video on YouTube – https://www.youtube.com/watch?v=hc77vAHZbVk
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Stefan's Law ( AQA A Level Physics )
Revision note.
Stefan's Law
- It's absolute temperature
- It's surface area
- The relationship between these is known as Stefan's Law or the Stefan-Boltzmann Law , which states:
The total energy emitted by a black body per unit area per second is proportional to the fourth power of the absolute temperature of the body
- The Stefan-Boltzmann Law can be calculated using:
- P = total power emitted across all wavelengths (W)
- σ = the -8 W m -2 K -4 " data-title="Stefan-Boltzmann Constant" data-toggle="popover">Stefan-Boltzmann constant
- A = surface area of the body (m)
- T = absolute temperature of the body (K)
- The Stefan-Boltzmann law is often used to calculate the luminosity of celestial objects, such as stars
- Where r = radius of the star
- The Stefan-Boltzmann equation then becomes:
- L = luminosity of the star (W)
- r = radius of the star (m)
- T = surface temperature of the star (K)
Worked example
The surface temperature of Proxima Centauri, the nearest star to Earth, is 3000 K and its luminosity is 6.506 × 10 23 W.
Calculate the radius of Proxima Centauri in solar radii and show your working clearly.
Solar radius R ☉ = 6.96 × 10 8 m
Step 1: List the known quantities:
- Surface temperature, T = 3000 K
- Luminosity, L = 6.506 × 10 23 W
- Stefan's constant, σ = 5.67 × 10 −8 W m −2 K −4
- Radius of the Sun, R ☉ = 6.96 × 10 8 m
Step 2: Write down the Stefan-Boltzmann equation and rearrange for radius r
Step 3: Substitute the values into the equation
Radius of Proxima Centauri: R = 1.061 × 10 8 m
Step 4: Find the ratio of the radii of Proxima Centauri and the Sun
- Proxima Centauri has a radius which is about 0.152 times smaller than the Sun
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VTU Engineering Physics Practical(Lab)
Monday, august 11, 2008.
- VERIFICATION OF STEFAN’S LAW
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5 comments:
its helped me. thanx
How can we calculate T temperature
Would you mind to help me with the values please
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This document contains answers to viva voce questions for the subjects of Engineering Physics Lab for 1st and 2nd semester students. It covers topics like Stefan's law, series and parallel resonance circuits, dielectric properties, and Fermi energy. The answers define key terms and concepts for these topics in physics experiments and calculations. Some highlights include Stefan's law relating ...
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2) Name the law that governs the phenomenon of thermal radiation. Stefan-Boltzmann Law rules the phenomenon of thermal radiation. This law states that the fourth power of the absolute temperature of a surface is proportional to the total radiant heat power emitted from that surface.
Heat Transfer Questions and Answers - Stefan- Boltzman Law. This set of Heat Transfer Multiple Choice Questions & Answers (MCQs) focuses on "Stefan- Boltzman Law". 1. The Stefan-Boltzmann constant has units of. a) kcal/m 2 hr K 4. b) kcal/m hr K 4. c) kcal/hr K 4. d) kcal/m 2 K 4. View Answer.
Stefan's law states that the energy radiated per second by unit area of a black body at thermodynamic temperature T is directly proportional to T 4. The constant of proportionality is the Stefan constant, equal to 5.670400 × 10 -8 Wm -2 K -4. This practical will verify this law using electrical method. Practical of verification of ...
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Step 1: List the known quantities: Surface temperature, T = 3000 K. Luminosity, L = 6.506 × 10 23 W. Stefan's constant, σ = 5.67 × 10 −8 W m −2 K −4. Radius of the Sun, R ☉ = 6.96 × 10 8 m. Step 2: Write down the Stefan-Boltzmann equation and rearrange for radius r. Step 3: Substitute the values into the equation.
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