0
question_answer1) The graph. Shown in the adjacent diagram, represents the variation of temperature (T) of two bodies, x and y having same surface area, with time (t) due to the emission of radiation. Find the correct relation between the emissivity (e) and absorptivity (a) of the two bodies [IIT-JEE (Screening) 2003]
question_answer2) The plots of intensity versus wavelength for three black bodies at temperatures T1, T2 and T3 respectively are as shown. Their temperature are such that [IIT-JEE (Screening) 2000]
question_answer3) The adjoining diagram shows the spectral energy density distribution \[{{E}_{\lambda }}\]of a black body at two different temperatures. If the areas under the curves are in the ratio 16 : 1, the value of temperature T is [DCE 1999]
question_answer4) Following graph shows the correct variation in intensity of heat radiations by black body and frequency at a fixed temperature
question_answer5) Variation of radiant energy emitted by sun, filament of tungsten lamp and welding arc as a function of its wavelength is shown in figure. Which of the following option is the correct match [IIT-JEE (Screening) 2005]
question_answer6) A body cools in a surrounding which is at a constant temperature of \[{{\theta }_{0}}\]. Assume that it obeys Newton's law of cooling. Its temperature \[\theta \] is plotted against time t. Tangents are drawn to the curve at the points \[P(\theta ={{\theta }_{1}})\] and \[Q(\theta ={{\theta }_{2}})\]. These tangents meet the time axis at angles of \[{{\varphi }_{2}}\]and \[{{\varphi }_{1}}\], as shown
question_answer7) Shown below are the black body radiation curves at temperatures T1 and T2 (T2>T1). Which of the following plots is correct [AIIMS 2003]
question_answer8) The spectrum of a black body at two temperatures 27oC and 327oC is shown in the figure. Let A1 and A2 be the areas under the two curves respectively. The value of \[\frac{{{A}_{2}}}{{{A}_{1}}}\] is
question_answer9) A block of metal is heated to a temperature much higher than the room temperature and allowed to cool in a room free from air currents. Which of the following curves correctly represents the rate of cooling [Manipal MEE 1995]
question_answer10) The energy distribution \[E\] with the wavelength \[(\lambda )\] for the black body radiation at temperature \[T\ Kelvin\]is shown in the figure. As the temperature is increased the maxima will
question_answer11) For a small temperature difference between the body and the surroundings the relation between the rate of loss heat R and the temperature of the body is depicted by
question_answer12) Heat is flowing through a conductor of length l from x = 0 to x = l. If its thermal resistance per unit length is uniform, which of the following graphs is correct
question_answer13) Radius of a conductor increases uniformly from left end to right end as shown in fig. Material of the conductor is isotropic and its curved surface is thermally isolated from surrounding. Its ends are maintained at temperatures T1 and T2 (T1 > T2): If, in steady state, heat flow rate is equal to H, then which of the following graphs is correct
question_answer14) Which of the following graphs correctly represents the relation between ln E and ln T where E is the amount of radiation emitted per unit time from unit area of a body and T is the absolute temperature [DCE 2002]
question_answer15) A hollow copper sphere S and a hollow copper cube C, both of negligible thin walls of same area, are filled with water at 90°C and allowed to cool in the same environment. The graph that correctly represents their cooling is
question_answer16) In the figure, the distribution of energy density of the radiation emitted by a black body at a given temperature is shown. The possible temperature of the black body is
question_answer17) Which of the following is the nm = T graph for a perfectly black body (nm =maximum frequency of radiation) [RPMT 1996]
Please Wait you are being redirected....
You need to login to perform this action.You will be redirected in 3 sec
OTP has been sent to your mobile number and is valid for one hour
Your mobile number is verified.