Explanation

• The color of a star is primarily determined by its surface temperature.
• Stars come in a range of colors, including red, orange, yellow, white, and blue, which are indicative of their surface temperatures.
• The hotter the star, the bluer it appears, while the cooler the star, the redder it appears.

Explanation

Explanation

Alunar eclipse can only occur during a full moon.

A lunar eclipse happens when the Earth is positioned between the Sun and the Moon, casting a shadow on the Moon. This can only happen when the Sun, Earth, and Moon are in a very close alignment, which is called a syzygy

Explanation

Solid carbon dioxide, also known as dry ice

It is a cooling agent that has a lower temperature than water ice and is solid

It is extremely cold, with a temperature of −109 °F (−78 °C). 

Explanation

The hardest substance in the world is diamond.

Its hardness is due to the strong covalent bonding between its carbon atoms.

This making it the most resistant to scratching.

Category: Native minerals

Cleavage: 111 (perfect in four directions)

Crystal class: Hexoctahedral (m3m); H-M symbol: (4/m 3 2/m)

Crystal habit: Octahedral

Crystal system: Cubic

Dana classification: 1.3.6.1

Density: 3.5–3.53 g/cm3 3500–3530 kg/m3

Explanation

Definition of Equator:

The equator is an imaginary 0° latitude line, encircling Earth’s midpoint.

It divides the planet into the Northern and Southern Hemispheres.

Explanation

When an electron jumps from a higher to a lower energy level, it radiates energy in the form of light or photons.

This process is responsible for the emission spectra seen in atoms.

Explanation

Explanation

A solar panel, consisting of many photovoltaic cells.

A photovoltaic (PV) cell is an energy harvesting technology.

It converts solar energy into useful electricity through a process called the photovoltaic effect.

Explanation

Frequency of sound refers to the number of vibrations per second.

It is measured in Hertz (Hz) — 1 Hz = 1 vibration per second.