Explanation

Relative permittivity is the ratio of a medium's is defined by:

1. The ratio of the electric field in vacuum to the electric field in the medium

and

2. The ratio of the capacitance with the medium to the capacitance with air

Explanation

A single chlorine-free radical (Cl•) can destroy up to 100,000 ozone (O₃) molecules. This significant impact on ozone is due to the catalytic nature of chlorine in the ozone depletion process.

Explanation

Apart from the sign,

the magnification factor, m, is equal to i/o

"I" is the image distance from the lens 

"o" is the object distance.

we have m=i/o

(8cm) / (20cm)

= 2/5.

Explanation

Anions are negatively charged ions.

They are formed when non-metal gains electrons.

They gain one or more than one electron.

Therefore, they possess a net negative charge.

____

Cations are ions that are positively charged

ND18-9-2023

Explanation

Dermatogen is the primary meristem that forms the outermost layer of a plant and forms the epidermis

Periblem is a primary meristem that is located between the plerome and the dermatogen and it forms the cortex

Plerome is the primary meristem that forms the central core of a plant 

Explanation

The transformer work only on an AC supply

because A transformer needs an alternating current that will create a changing magnetic field

note:

The transformer does not work on DC.

Direct current doesn't have a variable magnetic field

**

ND17-1-2023

Explanation

A thermometer is used to measure temperature in Celsius or Fahrenheit.

Celsius to Fahrenheit: Use the formula F=(Cx9/5)+32

Fahrenheit to Celsius: Use the formula C=(F-32)x (5/9)

Explanation

Lower temperatures favor the production of ammonia due to the exothermic nature of the reaction, but a moderate temperature (450°C) is typically used for optimal reaction speed and yield.

Explanation

The selective permeability of a membrane is primarily due to its lipid bilayer and the embedded proteins.

Lipids form the basic structure of the membrane, while proteins play roles in transport and signaling.

Explanation

The plasma in the Earth's ionosphere typically has temperatures ranging from about 1000°C to 2000°C

but it can be higher during periods of increased solar activity