Explanation

The power of the lens is the reciprocal of focal length.

The SI unit is dioptre.

Dioptre (D)

Power of lens = 1/ focal length in meter.

Explanation

Magnetic lines of force always form closed loops from the north pole to the south pole outside the magnet and continue inside the magnet.

They never start or end abruptly like electric field lines.

Explanation

The coordination number of the metal in [Cu(EDTA)]²⁻ is six because EDTA (Ethylenediaminetetraacetate) is a hexadentate ligand.

This meaning it can bind to the metal ion through six donor atoms.

Explanation

The period of a physical pendulum can be expressed in different ways, depending on the physical parameters of the pendulum. The physical pendulum is a rigid body that rotates around a fixed axis, and its period is given by:

• T = 2π√(I/Mgd) : This is the most general expression for the period of a physical pendulum, where I is the moment of inertia of the pendulum about the axis of rotation, M is the mass of the pendulum, g is the acceleration due to gravity, and d is the distance from the axis of rotation to the center of mass of the pendulum.
• T = 2π√(1/x) : This expression is a simplified version of the previous one, where x = (Mgd)/I.
• T = √(4L/g) : This expression is applicable when the physical pendulum is a simple pendulum, where L is the length of the pendulum.

Explanation

In a reversible process, the entropy of the system remains constant. 

 A key characteristic of a reversible process is that it can be reversed without leaving any net change in the system or its surroundings, including the entropy. 

Explanation

One Coulomb (C) is the unit of electric charge and is defined as the amount of charge transported by a steady current of 1 Ampere (A) flowing for 1 second.

Mathematically: 

1Coulomb=1Ampere×1second

This means that if a current of 1 Ampere flows through a conductor for 1 second, the total charge transported is 1 Coulomb.

Explanation

• Clouds float in the atmosphere because they are less dense than the surrounding air. Clouds are formed when water vapor in the air condenses into visible liquid droplets or ice crystals. These droplets or crystals are suspended in the air, and because they are less dense than the air, they float.
• The density of a cloud is typically around 0.05-0.5 g/m³, which is much less than the density of air, which is around 1.2 g/m³. This density difference allows clouds to remain suspended in the air, even though they are heavier than air in terms of their mass.

Explanation

Explanation

Let’s assume two cases:

• If $f = 3$ (monatomic gas), then:

  γ=3+2​/3=5/3​

• If $f = 5$ (diatomic gas), then:

  γ=5+2​/5=7/5​

Since the question asks for γ when degrees of freedom are 3 and 5, and γ = Cp/Cv, then:

• For f = 3 → γ = 5/3

Explanation

Cloud formation typically occurs in the atmosphere under constant pressure conditions, meaning it is an isobaric process