Physics-
General
Easy

Question

Which of the following is the nm = T graph for a perfectly black body (nm =maximum frequency of radiation)

  1. A    
  2. B    
  3. C    
  4. D    

The correct answer is: B


    Wein's law lambda subscript m end subscript proportional to fraction numerator 1 over denominator T end fraction or nu subscript m end subscript proportional to T
    nm increases with temperature. So the graph will be straight line

    Related Questions to study

    General
    physics-

    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

    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

    physics-General
    General
    physics-

    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 > T(b) : If, in steady state, heat flow rate is equal to H, then which of the following graphs is correct

    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 > T(b) : If, in steady state, heat flow rate is equal to H, then which of the following graphs is correct

    physics-General
    General
    physics-

    Water and turpentine oil (specific heat less than that of water) are both heated to same temperature. Equal amounts of these placed in identical calorimeters are then left in air

    Water and turpentine oil (specific heat less than that of water) are both heated to same temperature. Equal amounts of these placed in identical calorimeters are then left in air

    physics-General
    parallel
    General
    physics-

    Two conducting rods A and B of same length and cross-sectional area are connected (i) In series (ii) In parallel as shown. In both combination a temperature difference of 100°C is maintained. If thermal conductivity of A is 3K and that of B is K then the ratio of heat current flowing in parallel combination to that flowing in series combination is

    Two conducting rods A and B of same length and cross-sectional area are connected (i) In series (ii) In parallel as shown. In both combination a temperature difference of 100°C is maintained. If thermal conductivity of A is 3K and that of B is K then the ratio of heat current flowing in parallel combination to that flowing in series combination is

    physics-General
    General
    physics-

    The following figure shows two air-filled bulbs connected by a U-tube partly filled with alcohol. What happens to the levels of alcohol in the limbs X and Y when an electric bulb placed midway between the bulbs is lighted

    The following figure shows two air-filled bulbs connected by a U-tube partly filled with alcohol. What happens to the levels of alcohol in the limbs X and Y when an electric bulb placed midway between the bulbs is lighted

    physics-General
    General
    physics-

    The top of insulated cylindrical container is covered by a disc having emissivity 0.6 and thickness 1 cm. The temperature is maintained by circulating oil as shown in figure. If temperature of upper surface of disc is 127°C and temperature of surrounding is 27°C, then the radiation loss to the surroundings will be (Take sigma equals fraction numerator 17 over denominator 3 end fraction cross times 1 0 to the power of negative 8 end exponent W divided by m to the power of 2 end exponent K to the power of 4 end exponent right parenthesis

    The top of insulated cylindrical container is covered by a disc having emissivity 0.6 and thickness 1 cm. The temperature is maintained by circulating oil as shown in figure. If temperature of upper surface of disc is 127°C and temperature of surrounding is 27°C, then the radiation loss to the surroundings will be (Take sigma equals fraction numerator 17 over denominator 3 end fraction cross times 1 0 to the power of negative 8 end exponent W divided by m to the power of 2 end exponent K to the power of 4 end exponent right parenthesis

    physics-General
    parallel
    General
    physics-

    In the following figure, two insulating sheets with thermal resistances R and 3R as shown in figure. The temperature q is

    In the following figure, two insulating sheets with thermal resistances R and 3R as shown in figure. The temperature q is

    physics-General
    General
    physics-

    Five identical rods are joined as shown in figure. Point A and C are maintained at temperature 120°C and 20°C respectively. The temperature of junction B will be

    Five identical rods are joined as shown in figure. Point A and C are maintained at temperature 120°C and 20°C respectively. The temperature of junction B will be

    physics-General
    General
    physics-

    Two friends A and B are waiting for another friend for tea. A took the tea in a cup and mixed the cold milk and then waits. B took the tea in the cup and then mixed the cold milk when the friend comes. Then the tea will be hotter in the cup of

    Two friends A and B are waiting for another friend for tea. A took the tea in a cup and mixed the cold milk and then waits. B took the tea in the cup and then mixed the cold milk when the friend comes. Then the tea will be hotter in the cup of

    physics-General
    parallel
    General
    physics-

     A Copper plate is soldered between two steel plates . All the plates have the same cross- section (A) and length l. The coefficient of thermal expansions are alpha subscript c end subscript a n d alpha subscript s end subscript and their young’s moduli are y subscript c end subscript a n d y subscript s end subscript respectively. What force will arise in the plates if the temperature is increased by t to the power of 0 end exponent c ? (Assume that the plates suffer the same net expansion)

     A Copper plate is soldered between two steel plates . All the plates have the same cross- section (A) and length l. The coefficient of thermal expansions are alpha subscript c end subscript a n d alpha subscript s end subscript and their young’s moduli are y subscript c end subscript a n d y subscript s end subscript respectively. What force will arise in the plates if the temperature is increased by t to the power of 0 end exponent c ? (Assume that the plates suffer the same net expansion)

    physics-General
    General
    physics-

    Heat is extracted from a 1 kg substance at a constant rate of 2 kJ/ hour. Temperature vs-Time graph is plotted. The latent heat of substance is

    Heat is extracted from a 1 kg substance at a constant rate of 2 kJ/ hour. Temperature vs-Time graph is plotted. The latent heat of substance is

    physics-General
    General
    physics-

    A block of steel heated to 100 degree C is left in a room to cool. Which of the curves shown in figure represents the correct cooling behaviour?

    A block of steel heated to 100 degree C is left in a room to cool. Which of the curves shown in figure represents the correct cooling behaviour?

    physics-General
    parallel
    General
    physics-

    The energy distribution E with the wavelength left parenthesis lambda right parenthesis for the black body radiation at temperature T   K e l v i nis shown in the figure. As the temperature is increased the maxima will

    The energy distribution E with the wavelength left parenthesis lambda right parenthesis for the black body radiation at temperature T   K e l v i nis shown in the figure. As the temperature is increased the maxima will

    physics-General
    General
    physics-

    Shown below are the black body radiation curves at temperatures T1 and T2 (T2>T1) . Which of the following plots is correct

    Shown below are the black body radiation curves at temperatures T1 and T2 (T2>T1) . Which of the following plots is correct

    physics-General
    General
    physics-

    A body cools in a surrounding which is at a constant temperature of theta subscript 0 end subscript. 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 left parenthesis theta equals theta subscript 1 end subscript right parenthesis and Q left parenthesis theta equals theta subscript 2 end subscript right parenthesis. These tangents meet the time axis at angles of phi subscript 2 end subscriptand phi subscript 1 end subscript, as shown

    A body cools in a surrounding which is at a constant temperature of theta subscript 0 end subscript. 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 left parenthesis theta equals theta subscript 1 end subscript right parenthesis and Q left parenthesis theta equals theta subscript 2 end subscript right parenthesis. These tangents meet the time axis at angles of phi subscript 2 end subscriptand phi subscript 1 end subscript, as shown

    physics-General
    parallel

    card img

    With Turito Academy.

    card img

    With Turito Foundation.

    card img

    Get an Expert Advice From Turito.

    Turito Academy

    card img

    With Turito Academy.

    Test Prep

    card img

    With Turito Foundation.