MHT CET · Physics · Thermal Properties of Matter
If a black body at 400 K surrounded by atmosphere at 300 K has rate of cooling ' \(\mathrm{R}_0\) ', the same body at 900 K , surrounded by same atmosphere, will have rate of cooling nearly
- A \(4 R_0\)
- B \(16 \mathrm{R}_0\)
- C \(36 \mathrm{R}_0\)
- D \(\frac{81 \mathrm{R}_0}{16}\)
Answer & Solution
Correct Answer
(C) \(36 \mathrm{R}_0\)
Step-by-step Solution
Detailed explanation
\(R = \sigma A (T^4 - T_s^4)\) \(R_0 = \sigma A (400^4 - 300^4) = \sigma A (256 \times 10^8 - 81 \times 10^8) = \sigma A (175 \times 10^8)\)
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Physics
- A black body has maximum wavelength ' \(\lambda_{\mathrm{m}}\) ' at temperature \(2000 \mathrm{~K}\). Its corresponding wavelength at temperature \(3000 \mathrm{~K}\) will beMHT CET 2021 Easy
- The black discs \(x, y\) and \(z\) have radii \(1 \mathrm{~m}, 2 \mathrm{~m}\) and 3 m respectively. The wavelengths corresponding to maximum intensity are \(200 \mathrm{~nm}, 300 \mathrm{~nm}\) and 400 nm respectively. The relation between emissive power \(\mathrm{E}_{\mathrm{x}}, \mathrm{E}_{\mathrm{y}}\) and \(\mathrm{E}_{\mathrm{z}}\) isMHT CET 2024 Hard
- There are four convex lenses \(\mathrm{L}_{1}, \mathrm{~L}_{2}, \mathrm{~L}_{3}\) and \(\mathrm{L}_{4}\) of focal length \(2,4,6\) and \(8 \mathrm{~cm}\) respectively. Two of these lenses form a telescope of length \(10 \mathrm{~cm}\) and magnifying power 4 . The objective and eye lenses are respectivelyMHT CET 2020 Medium
- An ink mark is made on a piece of paper. A glass slab of thickness 't' is placed on it. The ink mark appears to be raised up through a distance ' \(x\) ' when viewed at nearly normal incidence. If the refractive index of material of glass slab is ' \(\mu\) ' then thickness of glass slab ' \(t\) ' is given byMHT CET 2024 Easy
- Consider the following statements about stationary waves
A. The distance between two adjacent nodes or antinodes is equal to \(\frac{\lambda}{2}(\lambda=\) wavelength of the wave \()\)
B. A pressure node is always formed at the open end of the open organ pipe.
choose the correct option from the followingMHT CET 2022 Medium - A uniform wire \(20 \mathrm{~m}\) long and weighing \(50 \mathrm{~N}\) hangs vertically. The speed of the wave at mid point of the wire is (acceleration due to gravity \(=\mathrm{g}=10 \mathrm{~ms}^{-2}\) )MHT CET 2023 Medium
More PYQs from MHT CET
- In tissue culture technique morphogenic differentiation of shoot and root is controlled by the interaction and ratio of ______________ .MHT CET 2023 Hard
- Which one of the following is NOT an example of commensalism?MHT CET 2018 Medium
- If 120 J of thermal energy is incident on area \(3 \mathrm{~m}^2\), the amount of heat transmitted is 12 J, coefficient of absorption is \(0.6\), then the amount of heat reflected isMHT CET 2025 Easy
- The general solution of differential equation isMHT CET 2018 Hard
- If \(\log (x+y)=\log (x y)+a\), where a is constant, then \(\frac{\mathrm{d} y}{\mathrm{~d} x}\) at \(x=2\) and \(y=4\) isMHT CET 2022 Medium
- Identify dispersed phase and dispersion medium in fog respectively.MHT CET 2024 Easy