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Consider the following statements with regard to radiation:
1. Transfer of heat by radiation requires a medium.
2. All hot bodies radiate infrared radiation.
Which of the statements given above is/are correct?
- a)1 only
- b)2 only
- c)Both 1 and 2
- d)Neither 1 nor 2
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
Consider the following statements with regard to radiation:1. Transfe...
Explanation:
Statement 1: Transfer of heat by radiation requires a medium
- This statement is incorrect. Radiation is the transfer of heat through electromagnetic waves and does not require a medium for propagation. Unlike conduction and convection, radiation can occur in a vacuum because it does not rely on the movement of particles to transfer heat. Therefore, heat transfer by radiation does not need a medium.
Statement 2: All hot bodies radiate infrared radiation
- This statement is correct. According to Planck's law of black-body radiation, all objects above absolute zero temperature emit electromagnetic radiation, with the intensity and wavelength distribution depending on the temperature of the object. Hotter objects emit shorter-wavelength radiation, including visible light and ultraviolet rays, but all objects also emit infrared radiation as a form of heat transfer. Therefore, all hot bodies radiate infrared radiation along with other wavelengths of electromagnetic radiation.
Therefore, the correct answer is Option B: 2 only.
Statement 1: Transfer of heat by radiation requires a medium
- This statement is incorrect. Radiation is the transfer of heat through electromagnetic waves and does not require a medium for propagation. Unlike conduction and convection, radiation can occur in a vacuum because it does not rely on the movement of particles to transfer heat. Therefore, heat transfer by radiation does not need a medium.
Statement 2: All hot bodies radiate infrared radiation
- This statement is correct. According to Planck's law of black-body radiation, all objects above absolute zero temperature emit electromagnetic radiation, with the intensity and wavelength distribution depending on the temperature of the object. Hotter objects emit shorter-wavelength radiation, including visible light and ultraviolet rays, but all objects also emit infrared radiation as a form of heat transfer. Therefore, all hot bodies radiate infrared radiation along with other wavelengths of electromagnetic radiation.
Therefore, the correct answer is Option B: 2 only.
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Consider the following statements with regard to radiation:1. Transfer of heat by radiation requires a medium.2. All hot bodies radiate infrared radiation.Which of the statements given above is/are correct?a) 1 onlyb) 2 onlyc) Both 1 and 2d) Neither 1 nor 2Correct answer is option 'B'. Can you explain this answer?
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