- What is the phenomenon of sound bouncing back from a surface called?
- Answer: Reflection
- Explanation: When sound waves strike a hard surface, they bounce back following the laws of reflection, similar to light.
- Which law does the reflection of sound follow?
- Answer: Equal Angle
- Explanation: The angle of incidence is equal to the angle of reflection, and both lie in the same plane.
- What is the repeated reflection of sound in a big hall called?
- Answer: Reverberation
- Explanation: Reverberation occurs when sound waves repeatedly reflect off walls and surfaces, prolonging the sound.
- What is the minimum time gap required between the original sound and its reflection to hear a distinct echo?
- Answer: 0.1s
- Explanation: The human brain retains sound for 0.1 seconds; if the reflected sound takes longer, an echo is heard.
- What is the minimum distance required for an echo to be heard?
- Answer: 17.2m
- Explanation: Since the speed of sound in air is about 344 m/s, the reflecting surface must be at least 17.2 meters away.
- What phenomenon causes rolling thunder to last longer?
- Answer: Multiple Reflection
- Explanation: The rolling sound of thunder is due to sound waves reflecting off clouds, land, and other surfaces multiple times.
- Which device uses multiple reflections of sound for better hearing?
- Answer: Stethoscope
- Explanation: The stethoscope uses multiple reflections to amplify the heartbeat sound for doctors.
- Which common instrument is designed to direct sound waves in one direction using reflection?
- Answer: Megaphone
- Explanation: A megaphone uses a conical shape to focus sound waves in a particular direction by reflecting them inward.
- What is the scientific term for sound waves reflecting back and merging with original sound, reducing clarity?
- Answer: Reverberation
- Explanation: Excessive reverberation in halls reduces sound clarity, making speech or music difficult to understand.
- What type of surfaces are best for sound reflection?
- Answer: Hard
- Explanation: Hard and smooth surfaces like walls, metal, and concrete reflect sound better than soft materials
