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Group displacement law



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Q1. A surface for which emissivity is constant at all temperatures and throughout the entire range of wavelength is called

(a) Opaque
(b) Grey
(c) Specular
(d) Diathermanous

Q2. Four identical pieces of copper painted with different colors of paints were heated to the same temperature and then left in the environment to cool. Which of the following paint will give fast cooling?

(a) White
(b) Rough
(c) Black
(d) Shining

Q3. A furnace emits radiation at 2000 K. Treating it as a black body radiation, calculate the wavelength at which emission is maximum

(a) 1.449 * 10 -6 m
(b) 2.449 * 10 -6 m
(c) 3.449 * 10 -6 m
(d) 4.449 * 10 -6 m

Q4. Consider the previous problem, determine the maximum monochromatic emissive power of the sun?s surface

(a) 4.908 * 10 13 W/m2
(b) 5.908 * 10 13 W/m2
(c) 6.908 * 10 13 W/m2
(d) 7.908 * 10 13 W/m2

Q5. The sun emits maximum radiation of 0.52 micron meter. Assuming the sun to be a black body, Calculate the surface temperature of the sun

(a) 2345 K
(b) 5573 K
(c) 9847 K
(d) 6492 K

Q6. A small black body has a total emissive power of 4.5 k W/m2. In which range of the spectrum does this wavelength fall?

(a) Thermal region
(b) Cosmic region
(c) Visible region
(d) Infrared region

Q7. A small body has a total emissive power of 4.5 kW/m2. Determine its surface temperature of maximum emission

(a) 530.77 K
(b) 345.65 K
(c) 236.54 K
(d) 367.8 K

Q8. Two spheres A and B of same material have radius 1 m and 4 m, and temperatures 4000 K and 2000 K respectively. Then the energy radiated by sphere A is

(a) Greater than that of sphere B
(b) Less than that of sphere B
(c) Equal to that of sphere B
(d) Two times that of sphere B

Q9. A body at 500 K cools by radiating heat to ambient atmosphere maintained at 300 K. When the body has cooled to 400 K, the cooling rate as a percentage of original rate is about

(a) 31.1
(b) 41.5
(c) 50.3
(d) 80.4

Q10. The relationship (Wavelength) MAX T = constant, between the temperature of a black body and the wavelength at which maximum value of monochromatic emissive power occurs is known as

(a) Planck?s law
(b) Kirchhoff?s law
(c) Lambert?s law
(d) Wein?s law


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349 views

On Bombarding 7N14 With α - Particles, The Nuclei Of The Product Formed After The Release Of A Proton Will Be

Modified 223 Year Ago

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223 Year Ago

On Bombarding 7N14 With α - Particles, The Nuclei Of The Product Formed After The Release Of A Proton Will Be

0 votes
0 Answer
273 views

β-particle Is Emitted In A Radioactive Reaction When

Modified 363 Year Ago

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363 Year Ago

β-particle Is Emitted In A Radioactive Reaction When

0 votes
0 Answer
266 views

The Number Of Beta Particles Emitted In The Radioactive Decay From 238/92 U And 206/82 Pb Is

Modified 363 Year Ago

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363 Year Ago

The Number Of Beta Particles Emitted In The Radioactive Decay From 238/92 U And 206/82 Pb Is

0 votes
0 Answer
264 views

When Any Radioactive Element Emits B-particle Some Product Is Obtained. They Both Are

Modified 363 Year Ago

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363 Year Ago

When Any Radioactive Element Emits B-particle Some Product Is Obtained. They Both Are

0 votes
0 Answer
260 views

A Position Is Emitted From 23/11 Na. The Ratio Of The Atomic Mass And Atomic Number Of The Resulting Nuclide Is

Modified 363 Year Ago Neysa

260
Neysa
363 Year Ago

A Position Is Emitted From 23/11 Na. The Ratio Of The Atomic Mass And Atomic Number Of The Resulting Nuclide Is

0 votes
0 Answer
256 views

Which Of The Following Nuclear Transformation Is (n, P) Type

Modified 223 Year Ago Ankush Sharma

256
Ankush Sharma
223 Year Ago

Which Of The Following Nuclear Transformation Is (n, P) Type

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