D Absorptive power of a body is defined as the ration of the heat absorbed by the body to heat incident on the body. A perfectly black body absorbs all the incident energy so it is a good absorber of radiation falls on is so its absorptive power is 1 .
Heat Transfer
149454
Three objects coloured black, gray and white can withstand hostile conditions at $2800^{\circ} \mathrm{C}$. These objects are thrown into furnace where each of them attains a temperature of $2000^{\circ} \mathrm{C}$. which object will glow brightest?
1 The white object
2 The black object
3 All glow with equal brightness
4 Grey object
Explanation:
B We know that, an ideal black body can absorb all radiations which incidence on it. Hence, when object of black colour \& gray and white colour, are thrown to furnace the black body radiate the maximum power on thus glow brightest among all objects at temperature of $2000^{\circ} \mathrm{C}$.
UPSEE - 2006
Heat Transfer
149462
For a perfect black body, the absorption coefficient is
1 $\mathrm{a}=1$
2 $\mathrm{a} \lt 1$
3 $a>1$
4 $a=0$
Explanation:
A For a perfect black body, absorption coefficient is 1 because black body does not allow transmission and reflection from its surface.
AP EAMCET (18.09.2020) Shift-I
Heat Transfer
149472
Newton's law of cooling is a special case of
1 Wien's displacement law
2 Kirchhoff's law
3 Stefan - law
4 Planck's law
Explanation:
C Newton's law of cooling is a special case of Stefan's law. Newton's law of cooling is derived from Stefan's law
CG PET- 2012
Heat Transfer
149479
Which of the following statement does not hold good for thermal radiation?
1 The wavelength changes when it travels from one medium to another
2 The frequency changes when it travels from one medium to another
3 The speed changes when it travels from one medium to another
4 They travel in straight line in a given medium
Explanation:
B Thermal radiation obeys the law of refraction and it travels along straight line like light. Hence, frequency does not change when travelling from one medium to another.
D Absorptive power of a body is defined as the ration of the heat absorbed by the body to heat incident on the body. A perfectly black body absorbs all the incident energy so it is a good absorber of radiation falls on is so its absorptive power is 1 .
Heat Transfer
149454
Three objects coloured black, gray and white can withstand hostile conditions at $2800^{\circ} \mathrm{C}$. These objects are thrown into furnace where each of them attains a temperature of $2000^{\circ} \mathrm{C}$. which object will glow brightest?
1 The white object
2 The black object
3 All glow with equal brightness
4 Grey object
Explanation:
B We know that, an ideal black body can absorb all radiations which incidence on it. Hence, when object of black colour \& gray and white colour, are thrown to furnace the black body radiate the maximum power on thus glow brightest among all objects at temperature of $2000^{\circ} \mathrm{C}$.
UPSEE - 2006
Heat Transfer
149462
For a perfect black body, the absorption coefficient is
1 $\mathrm{a}=1$
2 $\mathrm{a} \lt 1$
3 $a>1$
4 $a=0$
Explanation:
A For a perfect black body, absorption coefficient is 1 because black body does not allow transmission and reflection from its surface.
AP EAMCET (18.09.2020) Shift-I
Heat Transfer
149472
Newton's law of cooling is a special case of
1 Wien's displacement law
2 Kirchhoff's law
3 Stefan - law
4 Planck's law
Explanation:
C Newton's law of cooling is a special case of Stefan's law. Newton's law of cooling is derived from Stefan's law
CG PET- 2012
Heat Transfer
149479
Which of the following statement does not hold good for thermal radiation?
1 The wavelength changes when it travels from one medium to another
2 The frequency changes when it travels from one medium to another
3 The speed changes when it travels from one medium to another
4 They travel in straight line in a given medium
Explanation:
B Thermal radiation obeys the law of refraction and it travels along straight line like light. Hence, frequency does not change when travelling from one medium to another.
D Absorptive power of a body is defined as the ration of the heat absorbed by the body to heat incident on the body. A perfectly black body absorbs all the incident energy so it is a good absorber of radiation falls on is so its absorptive power is 1 .
Heat Transfer
149454
Three objects coloured black, gray and white can withstand hostile conditions at $2800^{\circ} \mathrm{C}$. These objects are thrown into furnace where each of them attains a temperature of $2000^{\circ} \mathrm{C}$. which object will glow brightest?
1 The white object
2 The black object
3 All glow with equal brightness
4 Grey object
Explanation:
B We know that, an ideal black body can absorb all radiations which incidence on it. Hence, when object of black colour \& gray and white colour, are thrown to furnace the black body radiate the maximum power on thus glow brightest among all objects at temperature of $2000^{\circ} \mathrm{C}$.
UPSEE - 2006
Heat Transfer
149462
For a perfect black body, the absorption coefficient is
1 $\mathrm{a}=1$
2 $\mathrm{a} \lt 1$
3 $a>1$
4 $a=0$
Explanation:
A For a perfect black body, absorption coefficient is 1 because black body does not allow transmission and reflection from its surface.
AP EAMCET (18.09.2020) Shift-I
Heat Transfer
149472
Newton's law of cooling is a special case of
1 Wien's displacement law
2 Kirchhoff's law
3 Stefan - law
4 Planck's law
Explanation:
C Newton's law of cooling is a special case of Stefan's law. Newton's law of cooling is derived from Stefan's law
CG PET- 2012
Heat Transfer
149479
Which of the following statement does not hold good for thermal radiation?
1 The wavelength changes when it travels from one medium to another
2 The frequency changes when it travels from one medium to another
3 The speed changes when it travels from one medium to another
4 They travel in straight line in a given medium
Explanation:
B Thermal radiation obeys the law of refraction and it travels along straight line like light. Hence, frequency does not change when travelling from one medium to another.
D Absorptive power of a body is defined as the ration of the heat absorbed by the body to heat incident on the body. A perfectly black body absorbs all the incident energy so it is a good absorber of radiation falls on is so its absorptive power is 1 .
Heat Transfer
149454
Three objects coloured black, gray and white can withstand hostile conditions at $2800^{\circ} \mathrm{C}$. These objects are thrown into furnace where each of them attains a temperature of $2000^{\circ} \mathrm{C}$. which object will glow brightest?
1 The white object
2 The black object
3 All glow with equal brightness
4 Grey object
Explanation:
B We know that, an ideal black body can absorb all radiations which incidence on it. Hence, when object of black colour \& gray and white colour, are thrown to furnace the black body radiate the maximum power on thus glow brightest among all objects at temperature of $2000^{\circ} \mathrm{C}$.
UPSEE - 2006
Heat Transfer
149462
For a perfect black body, the absorption coefficient is
1 $\mathrm{a}=1$
2 $\mathrm{a} \lt 1$
3 $a>1$
4 $a=0$
Explanation:
A For a perfect black body, absorption coefficient is 1 because black body does not allow transmission and reflection from its surface.
AP EAMCET (18.09.2020) Shift-I
Heat Transfer
149472
Newton's law of cooling is a special case of
1 Wien's displacement law
2 Kirchhoff's law
3 Stefan - law
4 Planck's law
Explanation:
C Newton's law of cooling is a special case of Stefan's law. Newton's law of cooling is derived from Stefan's law
CG PET- 2012
Heat Transfer
149479
Which of the following statement does not hold good for thermal radiation?
1 The wavelength changes when it travels from one medium to another
2 The frequency changes when it travels from one medium to another
3 The speed changes when it travels from one medium to another
4 They travel in straight line in a given medium
Explanation:
B Thermal radiation obeys the law of refraction and it travels along straight line like light. Hence, frequency does not change when travelling from one medium to another.
D Absorptive power of a body is defined as the ration of the heat absorbed by the body to heat incident on the body. A perfectly black body absorbs all the incident energy so it is a good absorber of radiation falls on is so its absorptive power is 1 .
Heat Transfer
149454
Three objects coloured black, gray and white can withstand hostile conditions at $2800^{\circ} \mathrm{C}$. These objects are thrown into furnace where each of them attains a temperature of $2000^{\circ} \mathrm{C}$. which object will glow brightest?
1 The white object
2 The black object
3 All glow with equal brightness
4 Grey object
Explanation:
B We know that, an ideal black body can absorb all radiations which incidence on it. Hence, when object of black colour \& gray and white colour, are thrown to furnace the black body radiate the maximum power on thus glow brightest among all objects at temperature of $2000^{\circ} \mathrm{C}$.
UPSEE - 2006
Heat Transfer
149462
For a perfect black body, the absorption coefficient is
1 $\mathrm{a}=1$
2 $\mathrm{a} \lt 1$
3 $a>1$
4 $a=0$
Explanation:
A For a perfect black body, absorption coefficient is 1 because black body does not allow transmission and reflection from its surface.
AP EAMCET (18.09.2020) Shift-I
Heat Transfer
149472
Newton's law of cooling is a special case of
1 Wien's displacement law
2 Kirchhoff's law
3 Stefan - law
4 Planck's law
Explanation:
C Newton's law of cooling is a special case of Stefan's law. Newton's law of cooling is derived from Stefan's law
CG PET- 2012
Heat Transfer
149479
Which of the following statement does not hold good for thermal radiation?
1 The wavelength changes when it travels from one medium to another
2 The frequency changes when it travels from one medium to another
3 The speed changes when it travels from one medium to another
4 They travel in straight line in a given medium
Explanation:
B Thermal radiation obeys the law of refraction and it travels along straight line like light. Hence, frequency does not change when travelling from one medium to another.
