Explanation

Because sound is just vibrating air, space has no air to vibrate and therefore no sound in a vacuum.

Sound waves below 20 Hz are known as infrasound.

Sound waves above 20 kHz are known as ultrasound

Sound waves transmit a medium such as a gas, liquid, or solid.

• The speed of sound in air is about 343 meters per second
• The sound travels at 1,481 m/s in water 
• The speed of sound in a vacuum is zero meters per second.

Explanation

A sphygmomanometer also known as a blood pressure monitor.

It is a device used to measure blood pressure.

A normal blood pressure level of 120/80 mmHg.

High-normal: 130 to 139 mmHg

High: Greater than 140 mmHg

while

mmHg stands for "Millimeter of Mercury"

Explanation

CNG stands for Compressed Natural Gas

Methane is the main component of CNG 

the modern use of CNG as a fuel source began in the 1930s,

American physicist Dr. J.P. Farley discovered that natural gas could be compressed to a high-pressure 

natural gas became a transport fuel during the First World War

Explanation

Prophet Muhammad PBUH have at the age of 40.

He and his wife had six children — two boys (who did not live into adulthood) and four girls.

By the time he was 40, he began having religious visions that would change his life.

This is Prophet Muhammad's mosque in Medina.

At the age of 40 in 11 BH (610 CE), Muhammad is said to have received his first verbal revelation in the cave called Hira, which was the beginning of the descent of the Quran that continued up to the end of his life.

Explanation

A convex lens has either one or both of its surfaces curving outwards, that is, wider divergence from the plan at the center.

These lenses are used to correct long-sightedness (hypermetropia).

Explanation

•  

  Saudi Arabia Capital is Riyadh.

  Saudi Arabia Currency is Saudi Riyal.

  Saudi Arabia official language is Arabic.

  Saudi Arabia located is in Continent Asia.

  Saudi Arabia Primary Religion is Islam.

  Saudi Arabia Head of Govt. is King and Prime Minister – Mohammed bin Salman.

  Saudi Arabia Parliament called Majlis Al Shura.

  Tricks for Remember

  AGM  5.2.23
  

Explanation

The height of the Eiffel Tower is 1063 feet

Architects: Stephen Sauvestre, Maurice Koechlin, Émile Nouguier

Explanation

Guglielmo Marconi was an Italian inventor and electrical engineer who is credited with the invention of the radio.

His work on long-distance radio transmission and the development of Marconi's law revolutionized wireless communication in the early 20th century.

Explanation

Explanation

The pattern is reversing the digits:

PEACH → HCAEP

26541 → 14562