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Consider the following statements:
1. For metals, the value of absorptivity is high
.2. For non-conducting materials, reflectivity is low.
3. For polished surfaces, reflectivity is high.
4. For gases, reflectivity is very low.Of these statements:
1. For metals, the value of absorptivity is high
.2. For non-conducting materials, reflectivity is low.
3. For polished surfaces, reflectivity is high.
4. For gases, reflectivity is very low.Of these statements:
- a)2, 3 and 4 are correct
- b)3 and 4 are correct
- c)1, 2 and 4 are correct
- d)1 and 2 are correct
Correct answer is option 'C'. Can you explain this answer?
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Consider the following statements:1. For metals, the value of absorpti...
Ans. (c)
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Consider the following statements:1. For metals, the value of absorpti...
Absorptivity, Reflectivity and Polished Surfaces
Absorptivity
- Absorptivity is the measure of how well a material absorbs electromagnetic radiation.
- Metals have a high absorptivity since they have a large number of free electrons.
- Free electrons allow metals to absorb electromagnetic radiation, which causes the electrons to vibrate and the metal to heat up.
Reflectivity
- Reflectivity is the measure of how well a material reflects electromagnetic radiation.
- Non-conducting materials have a low reflectivity since they do not have free electrons to reflect the radiation.
- Polished surfaces have a high reflectivity since they are smooth and can reflect electromagnetic radiation without scattering it.
Gases
- Gases have a very low reflectivity since they are not dense enough to reflect electromagnetic radiation.
- Gases can absorb electromagnetic radiation, but they do not reflect it.
Conclusion
- Statement 1 is correct since metals have a high absorptivity.
- Statement 2 is correct since non-conducting materials have a low reflectivity.
- Statement 4 is correct since gases have a very low reflectivity.
- Statement 3 is incorrect since polished surfaces have a high reflectivity, not a low one.
Absorptivity
- Absorptivity is the measure of how well a material absorbs electromagnetic radiation.
- Metals have a high absorptivity since they have a large number of free electrons.
- Free electrons allow metals to absorb electromagnetic radiation, which causes the electrons to vibrate and the metal to heat up.
Reflectivity
- Reflectivity is the measure of how well a material reflects electromagnetic radiation.
- Non-conducting materials have a low reflectivity since they do not have free electrons to reflect the radiation.
- Polished surfaces have a high reflectivity since they are smooth and can reflect electromagnetic radiation without scattering it.
Gases
- Gases have a very low reflectivity since they are not dense enough to reflect electromagnetic radiation.
- Gases can absorb electromagnetic radiation, but they do not reflect it.
Conclusion
- Statement 1 is correct since metals have a high absorptivity.
- Statement 2 is correct since non-conducting materials have a low reflectivity.
- Statement 4 is correct since gases have a very low reflectivity.
- Statement 3 is incorrect since polished surfaces have a high reflectivity, not a low one.
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Consider the following statements:1. For metals, the value of absorptivity is high.2. For non-conducting materials, reflectivity is low.3. For polished surfaces, reflectivity is high.4. For gases, reflectivity is very low.Of these statements:a)2, 3 and 4 are correctb)3 and 4 are correctc)1, 2 and 4 are correctd)1 and 2 are correctCorrect answer is option 'C'. Can you explain this answer?
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Solutions for Consider the following statements:1. For metals, the value of absorptivity is high.2. For non-conducting materials, reflectivity is low.3. For polished surfaces, reflectivity is high.4. For gases, reflectivity is very low.Of these statements:a)2, 3 and 4 are correctb)3 and 4 are correctc)1, 2 and 4 are correctd)1 and 2 are correctCorrect answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for Mechanical Engineering.
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