Download App

Thermal Properties of Matter — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysicsThermal Properties of Matter2 Marks
Question
Explain why:
A body with large reflectivity is a poor emitter.
✓

Answer

A body with a large reflectivity is a poor absorber of light radiations. A poor absorber will in turn be a poor emitter of radiations. Hence, a body with a large reflectivity is a poor emitter.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "2 Marks Questions" from Thermal Properties of Matter→Thermal Properties of Matter — all question types→Physics STD 11 Science question papers→Rajasthan Board STD 11 Science question papers→Rajasthan Board question paper generator→

Similar questions

The asteroid pallas has an orbital period of 4.62 year. Find the semi-major axis of its orbit. Given, G = 6.67 × 10-11Nm2 kg-2,
Mass of the sun = 1.99 × 1030kg and 1year
= 3.156 × 107s
→
A soap film of thickness 0.0011mm appears dark when seen by the reflected light of wavelength 580nm. What is the index of refraction of the soap solution, if it is known to be between 1.2 and 1.5?
→
Derive an expression for work done against gravity.
→
The force on a charged particle due to electric and magnetic fields is given by $\overrightarrow{\text{F}}=\text{q}\overrightarrow{\text{E}}+\text{q}\overrightarrow{\text{v}}\times\overrightarrow{\text{B}}.$ Suppose $\overrightarrow{\text{E}}$ is along the X-axis and $\overrightarrow{\text{B}}$ along the Y-axis. In what direction and with what minimum speed v should a positively charged particle be sent so that the net force on it is zero?
→
List any two characteristics of simple harmonic motion.
→
For which value of displacement are the potential and kinetic energies equal in value in simple harmonic motion?
→
Can you add three unit vectors to get a unit vector? Does your answer change if two unit vectors are along the coordinate axes?
→
A cricket ball is thrown at a speed of $28 m s ^{-1}$ in a direction 30 above the horizontal. Calculate (a) the maximum height, (b) the time taken by the ball to return to the same level, and (c) the distance from the thrower to the point where the ball returns to the same level.
→
If a balloon is filled will CO2 gas, then how can it behave as a lens for sound waves? If it was filled with hydrogen gas, then what will happen?
→
A famous relation in physics relates moving mass $m$ to the rest mass $m_0$ of a particle in terms of its speed $v$ and the speed of light, c. (This relation first arose as a consequence of special relativity due to Albert Einstein). A boy recalls the relation almost correctly but forgets where to put the constant c. He writes:
$m=\frac{m_0}{\left(1-v^2\right)^{\frac{1}{2}}}$. Guess where to put the missing c ?
→