MHT CET · Physics · Thermal Properties of Matter
A body is said to be opaque to the radiation if (a, \(r\) and \(t\) are coefficient of absorption, reflection and transmission respectively)
- A \(\mathrm{t}=0\) and \(\mathrm{a}+\mathrm{r}=1\)
- B \(\mathrm{a}=\mathrm{r}=\mathrm{t}\)
- C \(t \neq 0\)
- D \(\mathrm{a}=0, \mathrm{r}=1, \mathrm{t}=1\)
Answer & Solution
Correct Answer
(A) \(\mathrm{t}=0\) and \(\mathrm{a}+\mathrm{r}=1\)
Step-by-step Solution
Detailed explanation
Opaque body does not transmit any radiation directly,
\(
\begin{array}{ll}
\therefore & \mathrm{t}=0 \\
\therefore & \mathrm{a}+\mathrm{r}=1
\end{array}
\)
\(
\begin{array}{ll}
\therefore & \mathrm{t}=0 \\
\therefore & \mathrm{a}+\mathrm{r}=1
\end{array}
\)
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
- Ratio of radius of gyration of a circular dise to that of circular ring each of same mass and radius around their respective axes isMHT CET 2024 Easy
- A graph of magnetic flux \((\phi)\) versus current \((I)\) is drawn for four inductors A,B,C, D. Larger value of self-inductance is for inductor
MHT CET 2022 Easy - Two sound waves each of wavelength ' \(\lambda\) ' and having the same amplitude ' A ' from two source ' \(\mathrm{S}_1\) ' and ' \(\mathrm{S}_2\) ' interfere at a point P . If the path difference, \(\mathrm{S}_2 \mathrm{P}-\mathrm{S}_1 \mathrm{P}=\lambda / 3\) then the amplitude of resultant wave at point ' P ' will be \(\left[\cos \left(120^{\circ}\right)=-0.5\right]\)MHT CET 2024 Medium
- An inductor of \(\left(\frac{100}{\pi}\right) \mathrm{mH}\), capacitor of capacitance \(\left(\frac{10^{-3}}{2 \pi}\right) \mathrm{F}\) and resistance of \(10 \Omega\) are connected in series with an AC voltage source of \(110 \mathrm{~V}, 50 \mathrm{~Hz}\) supply. The tangent of the phase angle ' \(\phi\) ' between voltage and current isMHT CET 2025 Medium
- The moment of inertia of a body about the given axis, rotating with angular velocity \(1 \mathrm{rad} / \mathrm{s}\) is numerically equal to ' \(\mathrm{P}\) ' times its rotational kinetic energy. The value of ' \(\mathrm{P}\) ' isMHT CET 2021 Easy
- The fundamental frequency of an air column in a pipe closed at one end is 150 Hz . If the same pipe is open at both the end, the frequencies produces in Hz areMHT CET 2025 Medium
More PYQs from MHT CET
- Identify the product obtained when phenol is reacted with dilute nitric acid at low temperature.MHT CET 2023 Easy
- If \(|\vec{a}|=\sqrt{27},|\bar{b}|=7\) and \(|\vec{a} \times \bar{b}|=35\), then \(\bar{a} \cdot \bar{b}\) is equal toMHT CET 2024 Easy
- Ratio of centripetal acceleration for an electron revolving in \(3^{\text {rd }}\) orbit to \(5^{\text {th }}\) Bohr orbit of hydrogen atom isMHT CET 2020 Medium
- A physical place or set of environmental conditions around the organism to which it must adapt to survive and prosper is ________.MHT CET 2025 Easy
- The numbers can be formed using the digit \(1,2,3,4,3,2,1\) so that odd digits always occupy odd places in
ways.MHT CET 2021 Medium - Which of the following is positively charged sol?MHT CET 2023 Easy