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IV. Answer in brief.
1. Through which medium sound travels faster
iron or water? Give reason.
2. Name the physical quantity whose SI unit i
'hertz. Define.
3. What is meant by supersonic speed?
4. How does the sound produced by a vibrating
object in a medium reach your ears?
5. You and your friend are on the moon. Wil
you be able to hear any sound produced by
your friend?
Answers
Answer:
1) iron, because in solids the speed of sound is more than water.
2)Frequency- the no. of vibration produced in one second.
3)Supersonic speed is the speed of an object that exceeds the speed of sound (Mach 1). For objects travelling in dry air of a temperature of 20 °C at sea level, this speed is approximately 344 m/s, 1,125 ft/s, 768 mph, 667 knots or 1,235 km/h.
4)The vibrating object produces a series of compressions and rarefactions, one after the other in the medium. These pulses travel one behind the other as the sound waves move forward. When this sound wave reaches our ear, it forces the tympanic membrane to vibrate and thus causes the sensation of hearing.
5) no, because there is no medium on moon sound needs medium to travel
Please mark this answer as brainliest.
Answer:
1) iron - as it's a solid ( in solid medium sounds travel faster)
2) sound ,
The hertz (symbol: Hz) is the derived unit of frequency in the International System of Units (SI) and is defined as one cycle per second. It is named after Heinrich Rudolf Hertz, the first person to provide conclusive proof of the existence of electromagnetic waves.
3)supersonic. It's faster than the speed of sound, it's supersonic! ... Originally, the word supersonic meant "having to do with sound waves beyond human hearing," but by 1934 it described movement exceeding the speed of sound, with ultrasonic taking on the old meaning. Sonic comes from the Latin sonus, or "sound.
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