Explanation

• Wavelength is the distance between two successive crests or two successive troughs in a transverse wave.
• It represents one complete cycle of a wave.

Additional information:

• Symbol used: λ (Lambda)
• SI unit: meter (m)
• Wave formula: v = fλ
• Example wavelength values: 1 m, 0.5 m, 10 cm, 500 nm, 700 nm
• Visible light wavelength range: ~400 nm – 700 nm

Last verified on 12-03-2026

Explanation

• Pressure can be defined as the force acting per unit area.
•  Pascal (Pa) is the SI unit of pressure.
• In SI base units kg⋅m−1⋅s−2
• Derivations from other quantities: p = F / A
• Dimension unit: M L^−1 T^-2

Additional information 

The SI unit of energy/work is the joule (J)

Last updated on 09-03-2026

Explanation

Francium is extremely rare because it is highly radioactive and decays very quickly.

Only tiny trace amounts exist naturally in the Earth’s crust at any given time.

Explanation

The brain remains active during sleep, controlling breathing, heart rate, and dreaming.

Different sleep stages involve continuous brain activity, especially during REM sleep.

Explanation

A lightning bolt can reach about 30,000°C, while the Sun’s surface is around 5,500°C.

Thus, lightning is roughly 5 times hotter than the surface of the Sun.

Explanation

Octopus has blue-colored blood because it contains hemocyanin, which is copper-based.

Hemocyanin turns blue when oxygenated, unlike iron-based hemoglobin.

Explanation

When burned, copper produces a blue-green flame due to excited copper ions.

This color is commonly used in flame tests to identify copper.

Explanation

The cornea has no blood vessels to maintain transparency.

It receives oxygen and nutrients directly from the air and tears.

Explanation

Gallium melts at about 29.7 °C, slightly above normal room temperature.

Hence, it can melt in the hand, making it liquid near room conditions.

Explanation

• The planet that moves around the Sun at the largest speed is Mercury
• ***
• Mercury is the fastest planet, which speeds around the sun at 47.87 km/s.
• In miles per hour, this equates to a whopping 107,082 miles per hour.