Physics Test 24...

The energy required to remove the electron from a singly ionized Helium atom is 2.2 times the energy required to remove an electron from Helium atom. The total energy required to ionize the Helium atom completely is:

A solid sphere of mass 2 kg is resting inside a cube as shown in figure The cube is moving with a velocity  Here t is time in seconds. All surfaces are smooth. The sphere is at rest with respect to the cube. What is the total force exerted by the sphere on the cube?

A block is resting on a piston which executes simple harmonic motion in vertical plane with a period of 2.0 s in vertical plane at an amplitude just sufficient for the block to separate from the piston. The maximum velocity of the piston is

Determine the electric field intensity at point P due to quadruple distribution shown in figure for r ≫ a

Two capacitors of capacitances 0.3μF and 0.6μF are connected in series across 6 volts. The ratio of energies stored in them will be

Two coherent sources of intensity ratio 100 : 1, interfere. What is the ratio of the intensity between the maxima and minima in the interference pattern?

A block of pure silicon at 300 K has a length of 10 cm and an area of 1.0 × 10⁻⁴ m². If a battery of emf 2 V is connected across it, what is the electron current? The mobility of electrons is 0.14 m² V⁻¹ s⁻¹ and their number density is 1.5 × 10¹⁶ m⁻³.

Assertion: The speed of sound in a gas is not affected by change in pressure provided the temperature of the gas remains constant.

Reason: The speed of sound is inversely proportional to the square root of the density of the gas.

Two identical blocks A and B are placed on two inclined planes as shown in diagram. Neglect air resistance and other friction

Read the following statements and choose the correct options.

Statements I : Kinetic energy of 'A' on sliding to J will be greater than the kinetic energy of B on falling to M.

Statements II : Acceleration of ' A ' will be greater than acceleration of ' B ' when both are released to slide on inclined plane

Statements III : Work done by external agent to move block slowly from position B to O is negative

The length, breadth and thickness of a rectangular sheet of metal are 4.234 m, 1.005 m, and 2.01 cm respectively. Give the volume of the sheet to correct significant figures.