English
Karnataka Board PUCPUC Science Class 11

A Blackbody Does Not (A) Emit Radiation (B) Absorb Radiation (C) Reflect Radiation (D) Refract Radiation

Advertisements
Advertisements

Question

A blackbody does not

(a) emit radiation
(b) absorb radiation
(c) reflect radiation
(d) refract radiation

Short/Brief Note
Advertisements

Solution

(c) reflect radiation
(d) refract radiation

A black body is an ideal concept. A black body is the one that absorbs all the radiation incident on it. So, a black body does not reflect and refract radiation.

shaalaa.com
  Is there an error in this question or solution?
Chapter 6: Heat Transfer - MCQ [Page 97]

APPEARS IN

HC Verma Concepts of Physics Vol. 2 [English] Class 11 and 12
Chapter 6 Heat Transfer
MCQ | Q 2 | Page 97

Video TutorialsVIEW ALL [1]

RELATED QUESTIONS

Draw a neat labelled diagram for Ferry's perfectly black body.


Show graphical representation of energy distribution spectrum of perfectly black body.


The wavelength range of thermal radiation is

(A) from 4000 Å to 7000 Å

(B) from 7700 Å to 4 x 106 Å

(C) from 106 Å to 108 Å

(D) from 4 x 10-12 Å to 4 x 108 Å


Find the wavelength at which a black body radiates maximum energy, if its temperature is 427°C.
(Wein’s constant b = 2.898 × 10-3 mK)

(A) 0.0414 × 10-6m

(B) 4.14 × 10-6m

(C) 41.4 × 10-6m

(D) 414 × 10-6m


Explain black body radiation spectrum in terms of wavelength


What is perfectly black body ? Explain Ferry’s black body.


Does a body at 20°C radiate in a room, where the room temperature is 30°C? If yes, why does its temperature not fall further?


The thermal radiation emitted by a body is proportional to Tn where T is its absolute temperature. The value of n is exactly 4 for 


A cubical block of mass 1.0 kg and edge 5.0 cm is heated to 227°C. It is kept in an evacuated chamber maintained at 27°C. Assuming that the block emits radiation like a blackbody, find the rate at which the temperature of the block will decrease. Specific heat capacity of the material of the block is 400 J Kg-1 K-1.


A body cools down from 50°C to 45°C in 5 mintues and to 40°C in another 8 minutes. Find the temperature of the surrounding.


A metal ball of mass 1 kg is heated by means of a 20 W heater in a room at 20°C. The temperature of the ball becomes steady at 50°C. (a) Find the rate of loss of heat to the surrounding when the ball is at 50°C. (b) Assuming Newton's law of cooling, calculate the rate of loss of heat to the surrounding when the ball rises 30°C. (c) Assume that the temperature of the ball rises uniformly from 20°C to 30°C in 5 minutes. Find the total loss of heat to the surrounding during this period. (d) Calculate the specific heat capacity of the metal.


A hot body placed in a surrounding of temperature θ0 obeys Newton's law of cooling `(d theta)/(dt) = -K(theta - theta_0)`  . Its temperature at t = 0 is θ1. The specific heat capacity of the body is sand its mass is m. Find (a) the maximum heat that the body can lose and (b) the time starting from t = 0 in which it will lose 90% of this maximum heat.


Which of the following is an example of an ideal black body? 


Which of the following series of transitions in the spectrum of hydrogen atom falls in visible region?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×