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A polished metallic piece and a black painted wooden piece are kept in open in bright sun for a long time. Which of the following statements is/are correct ?
25
Oct
A polished metallic piece and a black painted wooden piece are kept in open in bright sun for a long time. Which of the following statements is/are correct ? A polished metallic piece and a black painted wooden piece are kept in open in bright sun for a long time. Which of the following statements [...]
During heat exchange, temperature of a solid mass does not change. In this process, heat
25
Oct
During heat exchange, temperature of a solid mass does not change. In this process, heat During heat exchange heat temperature of a solid mass does not change. In this process October 25, 2020 Category: Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) ,
Two models of a windowpane are made. In one model, two identical glass panes of thickness 3 mm are separated with an air gap of 3 mm. This composite system is fixed in the window of a room.
25
Oct
Two models of a windowpane are made. In one model, two identical glass panes of thickness 3 mm are separated with an air gap of 3 mm. This composite system is fixed in the window of a room. two identical glass panes of thickness 3 mm are separated with an air gap of 3 mm. [...]
A closed cubical box is made of a perfectly insulating material walls of thickness 8 cm and the only way for heat to enter or leave the box is through two solid metallic cylinderical plugs,
25
Oct
A closed cubical box is made of a perfectly insulating material walls of thickness 8 cm and the only way for heat to enter or leave the box is through two solid metallic cylinderical plugs, A closed cubical box is made of a perfectly insulating material walls of thickness 8 cm and the only way [...]
A black body is at a temperature of 2880 K. The energy of radiation emitted by this object with wavelength between 499 nm and 500 nm is U1, between 999 nm and 1000 nm is U2 and between
25
Oct
A black body is at a temperature of 2880 K. The energy of radiation emitted by this object with wavelength between 499 nm and 500 nm is U1, between 999 nm and 1000 nm is U2 and between A black body is at a temperature of 2880 K. The energy of radiation emitted by this [...]
A planet radiates heat at a rate proportional to the fourth power of its surface temperature T. If such a steady temperature of the planet is due to an exactly equal amount of heat
25
Oct
A planet radiates heat at a rate proportional to the fourth power of its surface temperature T. If such a steady temperature of the planet is due to an exactly equal amount of heat A planet radiates heat at a rate proportional to the fourth power of its surface temperature T. If such a steady [...]
The radiation emitted by a star A is 10000 times that of the sun. If the surface temperatures of the sun and star A are 60000 K and 2000 K, respectively, the ratio of the radii of the
25
Oct
The radiation emitted by a star A is 10000 times that of the sun. If the surface temperatures of the sun and star A are 60000 K and 2000 K, respectively, the ratio of the radii of the respectively The radiation emitted by a star A is 10000 times that of the sun. If the [...]
When the temperature of a black body increases, it is observed that the wavelength corresponding to maximum energy changes from 0.26 mu m to 0.13 mu m. The ratio of the
25
Oct
When the temperature of a black body increases, it is observed that the wavelength corresponding to maximum energy changes from 0.26 mu m to 0.13 mu m. The ratio of the it is observed that the wavelength corresponding to maximum energy changes from 0.26 mu m to 0.13 mu m. The ratio of the When [...]
A room at 20 C is heated by a heater of resistance 20 ohm connected to 200 V mains. The temperature is uniform throughout the room and the heat is transmitted through a glass
25
Oct
A room at 20 C is heated by a heater of resistance 20 ohm connected to 200 V mains. The temperature is uniform throughout the room and the heat is transmitted through a glass A room at 20 C is heated by a heater of resistance 20 ohm connected to 200 V mains. The temperature [...]
Two hollow spheres of different materials, one with double the radius and one-fourth wall thickness of the other, are filled with ice. If the times taken for complete melting of ice
25
Oct
Two hollow spheres of different materials, one with double the radius and one-fourth wall thickness of the other, are filled with ice. If the times taken for complete melting of ice are filled with ice. If the times taken for complete melting of ice one with double the radius and one-fourth wall thickness of the [...]