Question Answers
Sahay Sir > Question Answers
A black body is at a temperature of 2880 K. The energy of radiation emitted by this body with wavelength between 499 nm and 500 nm is U1, between 999 nm and 1000 nm, is U2 and between 1499 nm and 1500 nm is U3 . Wien’s constant, b = 2.88 × 10^6 nm−K. Then
10
Sep
A black body is at a temperature of 2880 K. The energy of radiation emitted by this body with wavelength between 499 nm and 500 nm is U1, between 999 nm and 1000 nm, is U2 and between 1499 nm and 1500 nm is U3 . Wien’s constant, b = 2.88 × 10^6 nm−K. Then [...]
A liquid in a beaker has temperature θ at time t and θ0 is temperature of surroundings, then according to Newton’s law of cooling, correct graph between loge (θ−θ 0 ) and t is :
10
Sep
A liquid in a beaker has temperature θ at time t and θ0 is temperature of surroundings, then according to Newton’s law of cooling, correct graph between loge (θ−θ 0 ) and t is : A liquid in a beaker has temperature θ at time t and θ0 is temperature of surroundings correct graph between [...]
A hot liquid is kept in a big room. Its temperature is plotted as a function of time. Which of the following curves may present the plot ?
10
Sep
A hot liquid is kept in a big room. Its temperature is plotted as a function of time. Which of the following curves may present the plot ? A hot liquid is kept in a big room. Its temperature is plotted as a function of time. Which of the following curves may present the plot [...]
A body cools from 50 C to 40 C in 5 min. The surrounding temperature is 20 C. In what further time (in min) will it cool to 30 C?
10
Sep
A body cools from 50 C to 40 C in 5 min. The surrounding temperature is 20 C. In what further time (in min) will it cool to 30 C? A body cools from 50 C to 40 C in 5 min. The surrounding temperature is 20 C. In what further time (in min) will [...]
The sun radiates energy in all directions. The average radiations received on the earth surface from the sun is 1.4 kilowatt/m^2. The average earth-sun distance is 1.5×10^11 meters. The mass lost by the sun per day is.
10
Sep
The sun radiates energy in all directions. The average radiations received on the earth surface from the sun is 1.4 kilowatt/m^2. The average earth-sun distance is 1.5×10^11 meters. The mass lost by the sun per day is. The temperature of an isolated black body falls from T1 to T2 in time t . Let c [...]
If the temperature of the sun were to increase from T to 2T and its radius from R to 2R, then the ratio of the radiant energy received on earth to what it was previously will be
10
Sep
If the temperature of the sun were to increase from T to 2T and its radius from R to 2R, then the ratio of the radiant energy received on earth to what it was previously will be If the temperature of the sun were to increase from T to 2T and its radius from R [...]
Relation between the colour and the temperature of a star is given by.
10
Sep
Relation between the colour and the temperature of a star is given by. Relation between the colour and the temperature of a star is given by. September 10, 2021 Category: Cengage NEET by C.P Singh , Chapter 22 - Heat Transfer , Part 1 ,
A body with an initial temperature θ1 is allowed to cool in surrounding which is at a constant temperature of θ0 (θ0 < θ1), Assume that Newton's law of cooling is obeyed. Let k=constant. The temperature of the body after time t is best expressed by
10
Sep
A body with an initial temperature θ1 is allowed to cool in surrounding which is at a constant temperature of θ0 (θ0
A sphere a cube and a thin circular plate all having same mass and made of same materials are heated to the same temperature and then allowed to cool. Which of then cool fastest ?
10
Sep
A sphere a cube and a thin circular plate all having same mass and made of same materials are heated to the same temperature and then allowed to cool. Which of then cool fastest ? A sphere a cube and a thin circular plate all having same mass and made of same materials are heated [...]
A solid sphere and a hollow sphere of the same material and of equal radii are heated to the same temperature.
10
Sep
A solid sphere and a hollow sphere of the same material and of equal radii are heated to the same temperature. A solid sphere and a hollow sphere of the same material and of equal radii are heated to the same temperature. September 10, 2021 Category: Cengage NEET by C.P Singh , Chapter 22 - [...]