LUNCIL Short Answer Questions: How do we produce sound? Explain briefly. 2 What are longitudinal waves? 3. What is the difference between infrasounds and ultrasounds? Can we hear them? 4 How does a bat make use of ultrasonic waves to find its way? 5. The sound of thunder is heard after the lightning seen during a thunderstorm. Why? please answer all questions
Answers
Explanation:
1. Sound is a type of energy made by vibrations. When an object vibrates, it causes movement in surrounding air molecules. These molecules bump into the molecules close to them, causing them to vibrate as well. This makes them bump into more nearby air molecules.
2. Longitudinal wave, wave consisting of a periodic disturbance or vibration that takes place in the same direction as the advance of the wave. ... Sound moving through air also compresses and rarefies the gas in the direction of travel of the sound wave as they vibrate back and forth.
3. The difference between infrasound and ultrasound is that infrasound is the barely audible low-frequency sound that humans can hear whereas ultrasound is the barely audible high-frequency sound. Both sounds are towards the ends of both sides of the human hearing frequency range, it is very difficult for humans to hear.
4. Bats catch insects continuously using echolocation, an advanced navigation system. The bat emits ultrasonic waves with very high frequencies. Their sounds are reflected in the environment, hitting various objects and returning to the bat as echoes.
5. Lightning is seen earlier and thunder is heard later because the speed of sound is 330 m/s and the speed of light is 300,000,000 m/s. Light travels faster than a sound. Thus, light from the lightning reaches first to you. The sound from the lightning takes longer to reach and hence heard later.
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