Title: Understanding Sonic Boom: Definition and Causes

Olusola
A grey fighter jet with a red and white emblem on its tail flies diagonally upwards against a clear blue sky, leaving a trail of reddish exhaust.

A sonic boom is the loud noise that sounds like an explosion. It is caused by an object, usually an aircraft, moving through the air faster than the speed of sound. Imagine a boat moving quickly through the water; it creates waves. Similarly, an airplane moving faster than sound creates pressure waves in the air. When these pressure waves reach the ground, we hear them as a sudden, loud “boom.”

How Sonic Booms Happen

As an aircraft flies, it pushes the air around it. At normal speeds, the air particles can move out of the way smoothly. However, when an aircraft reaches supersonic speeds (faster than the speed of sound), the air cannot move out of the way quickly enough. This causes the air particles to bunch up, forming shock waves.

These shock waves are like walls of highly compressed air. When the aircraft continues to move at supersonic speed, it constantly produces these shock waves. These waves travel outward and downward. When one of these shock waves passes over a listener, there is a sudden change in air pressure. This sudden change is what we perceive as a sonic boom. It’s not just a single boom but a continuous phenomenon along the aircraft’s flight path. However, a listener on the ground typically hears two distinct booms close together. This is because there are separate shock waves created at the front and the tail of the aircraft.

Factors Affecting the Sound of a Sonic Boom

The loudness and intensity of a sonic boom can be affected by several factors:

  • Size and Shape of the Aircraft: Larger and less aerodynamic aircraft tend to create stronger shock waves.
  • Speed of the Aircraft: The faster the aircraft flies above the speed of sound, the stronger the shock waves and the louder the boom.
  • Altitude of the Aircraft: The higher the altitude, the more the shock waves weaken before reaching the ground, resulting in a less intense boom.
  • Atmospheric Conditions: Factors like temperature and air density can influence how shock waves travel and how loud the sonic boom sounds on the ground.

While sonic booms are typically associated with military aircraft, any object moving faster than sound can create one, even something as small as a whip. However, aircraft are the most common cause of noticeable sonic booms.

For further reading on the effects and measurement of sonic booms, you can visit this page on NASA’s website: https://www.nasa.gov/mission_pages/shush/science/shockwave-interaction.html

References

Leave a Reply