The velocity of sound in air is doubled when the temperature is raised from 0°C to α°C. The value of α is ____.
The velocity of sound in air is doubled when the temperature is raised from 0°C to α°C Q. The velocity […]
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The average energy released per fission for the nucleus of 235U is 190 MeV. When all the atoms of 47 g pure 235U undergo fission process, the energy released is α × 10^23 MeV. The value of α is ____.
The average energy released per fission for the nucleus of 235U is 190 MeV when all the atoms of 47
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The size of the images of an object, formed by a thin lens are equal when the object is placed at two different positions 8 cm and 24 cm from the lens. The focal length of the lens is ____ cm.
The size of the images of an object formed by a thin lens are equal when the object is placed
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A prism of angle 75° and refractive index √3 is coated with thin film of refractive index 1.5 only at the back exit surface. To have total internal reflection at the back exit surface the incident angle must be ____. ( sin 15° = 0.25 and sin 25° = 0.43 )
A prism of angle 75° and refractive index √3 is coated with thin film of refractive index 1.5 only at
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When an unpolarized light falls at a particular angle on a glass plate (placed in air), it is observed that the reflected beam is linearly polarized. The angle of refracted beam with respect to the normal is ____. ( tan⁻¹(1.52) = 57.7°, refractive indices of air and glass are 1.00 and 1.52, respectively. )
When an unpolarized light falls at a particular angle on a glass plate, the reflected beam is linearly polarized. The
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An air bubble of volume 2.9 cm³ rises from the bottom of a swimming pool of 5 m deep. At the bottom of the pool water temperature is 17°C. The volume of the bubble when it reaches the surface, where the water temperature is 27°C, is ____ cm³. ( g = 10 m/s², density of water = 10³ kg/m³, and 1 atm pressure is 10⁵ Pa )
An air bubble of volume 2.9 cm³ rises from the bottom of a swimming pool of 5 m deep. Find
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A small metallic sphere of diameter 2 mm and density 10.5 g/cm³ is dropped in glycerine having viscosity 10 Poise and density 1.5 g/cm³ respectively. The terminal velocity attained by the sphere is ____ cm/s. (π = 22/7 and g = 10 m/s²)
A small metallic sphere of diameter 2 mm and density 10.5 g/cm³ is dropped in glycerine having viscosity 10 Poise
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The current passing through a conducting loop in the form of equilateral triangle of side 4√3 cm is 2 A. The magnetic field at its centroid is α × 10⁻⁵ T. The value of α is _____. (Given : μ₀ = 4π × 10⁻⁷ SI units)
The current passing through a conducting loop in the form of equilateral triangle of side 4√3 cm is 2 A.
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Two charges 7 μC and −2 μC are placed at (−9, 0, 0) cm and (9, 0, 0) cm respectively in an external field E = A/r² r̂, where A = 9 × 10⁵ N/C·m². Considering the potential at infinity is 0, the electrostatic energy of the configuration is ____ J.
Two charges 7 μC and −2 μC are placed at given points in an external electric field. Find the electrostatic
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To compare EMF of two cells using potentiometer the balancing lengths obtained are 200 cm and 150 cm. The least count of scale is 1 cm. The percentage error in the ratio of EMFs is ____.
To compare EMF of two cells using potentiometer the balancing lengths obtained are 200 cm and 150 cm. The least