Speed of sound is measured in ______ .

The correct answer is Metre/Second.

Confusion Points

• The loudness of a sound relates the intensity of any given sound to the intensity at the threshold of hearing.
• It is measured in decibels (dB).
• The threshold of human hearing has an intensity of about. 0000000000001 watts per meter squared and corresponds to 0 decibels.

Mistake Points

• Students might get confused by this type of question. Here we are not talking about the loudness of sound. We are talking about speed.
• The speed is simply the distance traveled by the time taken. So, the unit is m / s. 

Key Points

• Sound waves travel through a medium by alternately contracting and expanding the parts of the medium in which it travels.
• We know that speed is calculated using the simple formula
• Speed = Distance/Time
• The speed of sound is defined as the distance traveled per unit of time by any sound.
• The speed of sound is defined as the dynamic propagation of sound waves.
• This depends on the characteristics of the medium through which the propagation takes place. 
• Speed of sound is used for describing the speed of sound waves in an elastic medium.
• The speed of sound is an essential parameter used in a variety of fields in Physics. 
• The speed of sound refers to the distance traveled per unit time by a sound wave propagating through a medium.
• The speed of sound is the distance traveled per unit of time by a sound wave as it propagates through an elastic medium.
• At 20 °C (68 °F), the speed of sound in air is about 343 meters per second (1,235 km/h; 1,125 ft/s; 767 mph), or a kilometer in 2.9 s or a mile in 4.7 s. Hence, Option 4 is correct.

Additional Information

• An hour (symbol: h; also abbreviated hr)
  • It is a unit of time conventionally reckoned as 1⁄24 of a day and scientifically reckoned as 3,599–3,601 seconds, depending on conditions. 
• A decibel
  • It is a relative unit of measurement equal to one-tenth of a bel.
  • It expresses the ratio of two values of a power or root-power quantity on a logarithmic scale.
  • Two signals whose levels differ by one decibel have a power ratio of 101/10 or root-power ratio of 10¹⁄²⁰.
• Joule
  • The unit of work or energy in the International System of Units (SI); is equal to the work done by a force of one newton acting through one meter.
  • Named in honor of the English physicist James Prescott Joule, it equals 10⁷ ergs or approximately 0.7377 foot-pounds.