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.
NEET Test Series from KOTA - 10 Papers In MS WORD
WhatsApp Here
Heat Transfer
149450
A perfectly black body is one where
1 absorptive power is infinity
2 absorption point is 0
3 emissive power is 1
4 absorptive power is 1
Explanation:
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.