Which of the following statements is true/cor | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(B) Option $(a)$ is incorrect because during clear nights,objects on the surface of the Earth radiate heat,causing the temperature near the ground to

Vedclass · Accepted Answer

Newton's law of cooling,an approximate form of Stefan's law,is valid only for natural convection.

Vedclass · Answer

(B) Option $(a)$ is incorrect because during clear nights,objects on the surface of the Earth radiate heat,causing the temperature near the ground to fall.Option $(c)$ is incorrect because the total energy radiated by a black body per unit time per unit area is given by Stefan's law,$E \propto T^4$,not $T^2$.For option $(d)$,the energy radiated per second is given by $P = A \varepsilon \sigma T^4 = 4 \pi r^2 \varepsilon \sigma T^4$. Calculating the ratio: $\frac{P_1}{P_2} = \left( \frac{r_1}{r_2} ight)^2 \left( \frac{T_1}{T_2} ight)^4 = \left( \frac{1}{4} ight)^2 \left( \frac{4000}{2000} ight)^4 = \frac{1}{16} 	imes 16 = 1$. Since $P_1 = P_2$,option $(d)$ is incorrect.Option $(b)$ is correct because Newton's law of cooling is an approximate form of Stefan's law of radiation and is valid for small temperature differences,typically observed in natural convection.

Which of the following statements is true/correct?

Similar Questions

Among the following compounds,which one is not responsible for the depletion of the ozone layer?

The position vectors of $P$ and $Q$ are respectively $\overrightarrow{a}$ and $\overrightarrow{b}$. If $R$ is a point such that $\overrightarrow{PR}=5 \overrightarrow{PQ}$, then the position vector of $R$ is

What is the $IUPAC$ name of the following compound?

Chlorination of toluene in the presence of light and heat followed by treatment with aqueous $NaOH$ yields:

$\sqrt{3} \operatorname{cosec} 20^{\circ} - \sec 20^{\circ}$ is equal to

Vedclass Test Series

Exam Paper Generator

Online Exam Module