Question:
S.I. unit of emissive power of a body at a given temperature is
S.I. unit of emissive power of a body at a given temperature is
Show Hint
Emissive power always involves both area and time in its unit.
Updated On: Feb 4, 2026
- $\dfrac{J}{m^2 s}$
- $\dfrac{J}{m^2}$
- $\dfrac{J}{s}$
- $\dfrac{W}{m}$
Show Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Step 1: Define emissive power.
Emissive power is defined as the radiant energy emitted per unit area of a surface per unit time.
Step 2: Write dimensional meaning.
\[ \text{Emissive power} = \dfrac{\text{Energy}}{\text{Area} \times \text{Time}} \] Step 3: Identify SI unit.
\[ \text{SI unit} = \dfrac{\text{Joule}}{m^2 \cdot s} \]
Emissive power is defined as the radiant energy emitted per unit area of a surface per unit time.
Step 2: Write dimensional meaning.
\[ \text{Emissive power} = \dfrac{\text{Energy}}{\text{Area} \times \text{Time}} \] Step 3: Identify SI unit.
\[ \text{SI unit} = \dfrac{\text{Joule}}{m^2 \cdot s} \]
Was this answer helpful?
0
0
Top MHT CET Physics Questions
- In non uniform circular motion, the ratio of tangential to radial acceleration is (r = radius of circle, $v =$ speed of the particle, $\alpha =$ angular acceleration)
- A particle moves along a circle of radius ?$r$? with constant tangential acceleration. If the velocity of the particle is ?$?$? at the end of second revolution, after the revolution has started then the tangential acceleration is
- If $M_z$ = magnetization of a paramagnetic sample, $B$ = external magnetic field, $T$ = absolute temperature, $C$ = curie constant then according to Curie�s law in magnetism, the correct relation is
- In a fundamental mode, the time required for the sound wave to reach upto the closed end of a pipe filled with air is $'t'$ second. The frequency of vibration of air column is
- In a parallel plate capacitor, the capacity increases if
View More Questions
Top MHT CET Thermal Physics Questions
- Rate of radiation by a black body is $R$ at temperature $T$. Another body has the same area but emissivity is $0.2$ and temperature is $3T$. Its rate of radiation is
- What is the percentage decrease in the weight of a body when it is taken to a height of 32 km from the surface of earth?
(Given: \( R = 6400 \, \text{km} \))
- The size of the real image produced by a convex lens of focal length \(F\) is \(m\) times the size of the object. The image distance from the lens is
- Two stars 'A' and 'B' radiate maximum energy at \(5200\text{ \AA}\) and \(6500\text{ \AA}\) respectively. Then the ratio of absolute temperatures of stars ' A ' and ' B ' is
- Two stars 'A' and 'B' radiate maximum energy at \(5200\text{ \AA}\) and \(6500\text{ \AA}\) respectively. Then the ratio of absolute temperatures of stars ' A ' and ' B ' is
Top MHT CET Questions
- During r- DNA technology, which one of the following enzymes is used for cleaving DNA molecule ?
- In non uniform circular motion, the ratio of tangential to radial acceleration is (r = radius of circle, $v =$ speed of the particle, $\alpha =$ angular acceleration)
- The temperature of $32^{\circ}C$ is equivalent to
- The line $5x + y - 1 = 0$ coincides with one of the lines given by $5x^2 + xy - kx - 2y + 2 = 0 $ then the value of k is
- The heat of formation of water is $ 260\, kJ $ . How much $ H_2O $ is decomposed by $ 130\, kJ $ of heat ?
View More Questions