02. Radiation
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Heat Transfer

149488 Ratio of radiant energy emitted per unit area per second by two stars is $16: 81$. The ratio of wavelengths at which intensity of radiant energy is maximum is given by

1 $9: 4$
2 $4: 9$
3 $2: 3$
4 $3: 2$
COMEDK 2011
Heat Transfer

149489 A black body at a temperature of $1640 \mathrm{~K}$ has the wavelength corresponding to maximum emission equal to $1.75 \mu \mathrm{m}$. Assuming the moon to be a perfectly black body, the temperature of the moon, if the wavelength corresponding to maximum emission is $\mathbf{1 4 . 3 5} \mu \mathrm{m}$ is

1 $100 \mathrm{~K}$
2 $150 \mathrm{~K}$
3 $200 \mathrm{~K}$
4 $250 \mathrm{~K}$
COMEDK 2019
Heat Transfer

149490 Assertion: A hollow metallic closed container maintained at a uniform temperature can act as a source of black body radiation.
Reason: All metals act as black bodies.

1 If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
2 If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
3 If the Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
5 If the Assertion is incorrect but the Reason is correct.
AIIMS-2007
Heat Transfer

149491 Assertion: For higher temperature the peak emission wavelength of a blackbody shifts to lower wavelengths.
Reason: Peak emission wavelengths of a black body is proportional to the fourth-power of temperature.

1 If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
2 If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
3 If the Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
5 If the Assertion is incorrect but the Reason is correct.
AIIMS-2005
Heat Transfer

149493 If the temperature of a black body increases from $7^{\circ} \mathrm{C}$ to $287^{\circ} \mathrm{C}$ then the rate of energy radiation increases by

1 $\left(\frac{287}{7}\right)^{4}$
2 16
3 4
4 2
AIIMS- 1997
NEET DIGITAL LIBRARY
Heat Transfer

149488 Ratio of radiant energy emitted per unit area per second by two stars is $16: 81$. The ratio of wavelengths at which intensity of radiant energy is maximum is given by

1 $9: 4$
2 $4: 9$
3 $2: 3$
4 $3: 2$
COMEDK 2011
Heat Transfer

149489 A black body at a temperature of $1640 \mathrm{~K}$ has the wavelength corresponding to maximum emission equal to $1.75 \mu \mathrm{m}$. Assuming the moon to be a perfectly black body, the temperature of the moon, if the wavelength corresponding to maximum emission is $\mathbf{1 4 . 3 5} \mu \mathrm{m}$ is

1 $100 \mathrm{~K}$
2 $150 \mathrm{~K}$
3 $200 \mathrm{~K}$
4 $250 \mathrm{~K}$
COMEDK 2019
Heat Transfer

149490 Assertion: A hollow metallic closed container maintained at a uniform temperature can act as a source of black body radiation.
Reason: All metals act as black bodies.

1 If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
2 If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
3 If the Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
5 If the Assertion is incorrect but the Reason is correct.
AIIMS-2007
Heat Transfer

149491 Assertion: For higher temperature the peak emission wavelength of a blackbody shifts to lower wavelengths.
Reason: Peak emission wavelengths of a black body is proportional to the fourth-power of temperature.

1 If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
2 If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
3 If the Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
5 If the Assertion is incorrect but the Reason is correct.
AIIMS-2005
Heat Transfer

149493 If the temperature of a black body increases from $7^{\circ} \mathrm{C}$ to $287^{\circ} \mathrm{C}$ then the rate of energy radiation increases by

1 $\left(\frac{287}{7}\right)^{4}$
2 16
3 4
4 2
AIIMS- 1997
Join With Us for More Updates
Heat Transfer

149488 Ratio of radiant energy emitted per unit area per second by two stars is $16: 81$. The ratio of wavelengths at which intensity of radiant energy is maximum is given by

1 $9: 4$
2 $4: 9$
3 $2: 3$
4 $3: 2$
COMEDK 2011
Heat Transfer

149489 A black body at a temperature of $1640 \mathrm{~K}$ has the wavelength corresponding to maximum emission equal to $1.75 \mu \mathrm{m}$. Assuming the moon to be a perfectly black body, the temperature of the moon, if the wavelength corresponding to maximum emission is $\mathbf{1 4 . 3 5} \mu \mathrm{m}$ is

1 $100 \mathrm{~K}$
2 $150 \mathrm{~K}$
3 $200 \mathrm{~K}$
4 $250 \mathrm{~K}$
COMEDK 2019
Heat Transfer

149490 Assertion: A hollow metallic closed container maintained at a uniform temperature can act as a source of black body radiation.
Reason: All metals act as black bodies.

1 If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
2 If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
3 If the Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
5 If the Assertion is incorrect but the Reason is correct.
AIIMS-2007
Heat Transfer

149491 Assertion: For higher temperature the peak emission wavelength of a blackbody shifts to lower wavelengths.
Reason: Peak emission wavelengths of a black body is proportional to the fourth-power of temperature.

1 If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
2 If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
3 If the Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
5 If the Assertion is incorrect but the Reason is correct.
AIIMS-2005
Heat Transfer

149493 If the temperature of a black body increases from $7^{\circ} \mathrm{C}$ to $287^{\circ} \mathrm{C}$ then the rate of energy radiation increases by

1 $\left(\frac{287}{7}\right)^{4}$
2 16
3 4
4 2
AIIMS- 1997
For More Updates join with Us
Heat Transfer

149488 Ratio of radiant energy emitted per unit area per second by two stars is $16: 81$. The ratio of wavelengths at which intensity of radiant energy is maximum is given by

1 $9: 4$
2 $4: 9$
3 $2: 3$
4 $3: 2$
COMEDK 2011
Heat Transfer

149489 A black body at a temperature of $1640 \mathrm{~K}$ has the wavelength corresponding to maximum emission equal to $1.75 \mu \mathrm{m}$. Assuming the moon to be a perfectly black body, the temperature of the moon, if the wavelength corresponding to maximum emission is $\mathbf{1 4 . 3 5} \mu \mathrm{m}$ is

1 $100 \mathrm{~K}$
2 $150 \mathrm{~K}$
3 $200 \mathrm{~K}$
4 $250 \mathrm{~K}$
COMEDK 2019
Heat Transfer

149490 Assertion: A hollow metallic closed container maintained at a uniform temperature can act as a source of black body radiation.
Reason: All metals act as black bodies.

1 If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
2 If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
3 If the Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
5 If the Assertion is incorrect but the Reason is correct.
AIIMS-2007
Heat Transfer

149491 Assertion: For higher temperature the peak emission wavelength of a blackbody shifts to lower wavelengths.
Reason: Peak emission wavelengths of a black body is proportional to the fourth-power of temperature.

1 If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
2 If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
3 If the Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
5 If the Assertion is incorrect but the Reason is correct.
AIIMS-2005
Heat Transfer

149493 If the temperature of a black body increases from $7^{\circ} \mathrm{C}$ to $287^{\circ} \mathrm{C}$ then the rate of energy radiation increases by

1 $\left(\frac{287}{7}\right)^{4}$
2 16
3 4
4 2
AIIMS- 1997
NEET DIGITAL LIBRARY
Heat Transfer

149488 Ratio of radiant energy emitted per unit area per second by two stars is $16: 81$. The ratio of wavelengths at which intensity of radiant energy is maximum is given by

1 $9: 4$
2 $4: 9$
3 $2: 3$
4 $3: 2$
COMEDK 2011
Heat Transfer

149489 A black body at a temperature of $1640 \mathrm{~K}$ has the wavelength corresponding to maximum emission equal to $1.75 \mu \mathrm{m}$. Assuming the moon to be a perfectly black body, the temperature of the moon, if the wavelength corresponding to maximum emission is $\mathbf{1 4 . 3 5} \mu \mathrm{m}$ is

1 $100 \mathrm{~K}$
2 $150 \mathrm{~K}$
3 $200 \mathrm{~K}$
4 $250 \mathrm{~K}$
COMEDK 2019
Heat Transfer

149490 Assertion: A hollow metallic closed container maintained at a uniform temperature can act as a source of black body radiation.
Reason: All metals act as black bodies.

1 If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
2 If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
3 If the Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
5 If the Assertion is incorrect but the Reason is correct.
AIIMS-2007
Heat Transfer

149491 Assertion: For higher temperature the peak emission wavelength of a blackbody shifts to lower wavelengths.
Reason: Peak emission wavelengths of a black body is proportional to the fourth-power of temperature.

1 If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
2 If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
3 If the Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
5 If the Assertion is incorrect but the Reason is correct.
AIIMS-2005
Heat Transfer

149493 If the temperature of a black body increases from $7^{\circ} \mathrm{C}$ to $287^{\circ} \mathrm{C}$ then the rate of energy radiation increases by

1 $\left(\frac{287}{7}\right)^{4}$
2 16
3 4
4 2
AIIMS- 1997