Explanation

Sickle cell anemia is caused by a mutation in the gene that codes for the beta-globin chain of hemoglobin,

where valine is substituted for glutamic acid at the sixth position, causing the red blood cells to assume a sickle shape.

Explanation

The cells contained in the lacunae of the bone are called osteocytes.

Explanation

The diffusion of sodium ions across the postsynaptic membrane causes it to depolarize, initiating a new action potential.

Explanation

The presence of a dielectric material between the plates of a capacitor reduces the electric field by a factor called the dielectric constant 𝐾

The electric field E in a capacitor with a dielectric is related to the field E0 without the dielectric by:

E= E0/K

​When the dielectric material is removed, the dielectric constant K becomes 1 (for vacuum or air), and the electric field reverts to its original strength, increasing by a factor of 𝐾

Thus, when the dielectric is removed, the electric field increases.

Explanation

The momentum 

𝑝 of a photon is given by the equation:

𝑝=ℎ/𝜆 

where:

h is Planck's constant,

λ is the wavelength of the photon.

Since photons are massless, their momentum is not related to mass but to their wavelength.

Explanation

An electron volt (eV) is a unit of energy.

It is defined as the amount of kinetic energy gained or lost by a single electron when it is accelerated through an electric potential difference of one volt.

Specifically:

1eV=1.602×10 −19 Joules

Thus, the electron volt is a convenient unit for measuring small amounts of energy, particularly in the fields of atomic and particle physics.

Explanation

Explanation

Among the given options, n-propyl alcohol has the highest boiling point due to its linear structure allowing more hydrogen bonding.

Explanation

The blue color of a Cu²⁺ salt solution is due to the transition of electrons within the d-orbitals (from one d orbital to another, i.e., a d-d transition).

Explanation

For a rigid body that rotates about a fixed axis, the angle swept out by a line passing through any point on the body and intersecting the axis of rotation perpendicularly is called angular displacement.