Question Answers
Sahay Sir > Question Answers
A metal is heated in a furnace where a sensor is kept above the metal surface to read the power radiated (P) by the metal. The sensor has a scale that displays log2 (P/P0), where P0 is a constant.
27
Oct
A metal is heated in a furnace where a sensor is kept above the metal surface to read the power radiated (P) by the metal. The sensor has a scale that displays log2 (P/P0), where P0 is a constant. A metal is heated in a furnace where a sensor is kept above the metal surface [...]
Two spherical stars A and B emit blackbody radiation. The radius of A is 400 times that of B and A emits 10^4 times the power emitted from B. The ratio (lemda a / lemda b) of their wavelengths
27
Oct
Two spherical stars A and B emit blackbody radiation. The radius of A is 400 times that of B and A emits 10^4 times the power emitted from B. The ratio (lemda a / lemda b) of their wavelengths Two spherical stars A and B emit blackbody radiation. The radius of A is 400 times [...]
The apparent depth of water in cylindrical water tank of diameter 2R cm is reducing at the rate of x cm/minute when water is being drained out at a constant rate. The amount of water drained in c.c, per minute is : ( n1 = refractive index of air, n2 = refractive index of water)
27
Oct
The apparent depth of water in cylindrical water tank of diameter 2R cm is reducing at the rate of x cm/minute when water is being drained out at a constant rate. The amount of water drained in c.c, per minute is : ( n1 = refractive index of air, n2 = refractive index of [...]
A telescope has an objective lens of focal length 200 cm and an eyepiece with focal length 2 cm. It is used to see a 50 m tall building at a distance of 2 km. What is the height of the image of building formed by the objective lens?
27
Oct
A telescope has an objective lens of focal length 200 cm and an eyepiece with focal length 2 cm. It is used to see a 50 m tall building at a distance of 2 km. What is the height of the image of building formed by the objective lens? respectively What should be the maximum [...]
The circuit given in figure has a resistanceless hoke coil L and a resistance R . The voltages acriss R and L are also given in the figure. The virtual value of the applied voltage is
27
Oct
The circuit given in figure has a resistanceless hoke coil L and a resistance R . The voltages acriss R and L are also given in the figure. The virtual value of the applied voltage is The circuit given in figure has a resistanceless hoke coil L and a resistance R . The voltages acriss [...]
Two spherical bodies A (radius 6 cm) and B (radius 18 cm) are at temperature T1 and T2 respectively. The maximum intensity in the emission spectrum of A is at 500 nm and in that of
27
Oct
Two spherical bodies A (radius 6 cm) and B (radius 18 cm) are at temperature T1 and T2 respectively. The maximum intensity in the emission spectrum of A is at 500 nm and in that of Two spherical bodies A (radius 6 cm) and B (radius 18 cm) are at temperature T1 and T2 respectively. [...]
A metal rod AB of length 10 x has its one end A in ice at 0 C and the other end B in water at 100 C. If a point P on the rod is maintained at 400 C, then it is found that equal amounts of
27
Oct
A metal rod AB of length 10 x has its one end A in ice at 0 C and the other end B in water at 100 C. If a point P on the rod is maintained at 400 C, then it is found that equal amounts of A metal rod AB of length 10 [...]
Figure shows an iron- cored transformer assumed to be 100 % efficient. The ratio of the secondary turns to the primary turns is 1 :20.
27
Oct
Figure shows an iron- cored transformer assumed to be 100 % efficient. The ratio of the secondary turns to the primary turns is 1 :20. Figure shows an iron- cored transformer assumed to be 100 % efficient. The ratio of the secondary turns to the primary turns is 1 :20. October 27, 2020 Category: Uncategorised [...]
A human body has a surface area of approximately 1 m^2. The normal body temperature is 10 K above the surrounding room temperature T0. Take the room temperature to be
27
Oct
A human body has a surface area of approximately 1 m^2. The normal body temperature is 10 K above the surrounding room temperature T0. Take the room temperature to be A human body has a surface area of approximately 1 m^2. The normal body temperature is 10 K above the surrounding room temperature T0. Take [...]
An incandescent bulb has a thin filament of tungsten that is heated to high temperature by passing an electric current. The hot filament emits black-body radiation. The filament is observed
27
Oct
An incandescent bulb has a thin filament of tungsten that is heated to high temperature by passing an electric current. The hot filament emits black-body radiation. The filament is observed An incandescent bulb has a thin filament of tungsten that is heated to high temperature by passing an electric current. The hot filament emits black-body [...]