A person is standing in front of a wall and makes a sound. What should be the normal minimum distance between the person and the wall , so that the person hears echo?

Related MCQs

• A long Rail (approximately 700 meters) made up of steel is struck to produce a sound. The person standing on the other end of the rail would hear in which among the following pattern?
• Above 70 °C, sodium bicarbonate has a property of gradually decomposing, which makes it usable in Bakery products. Which among the following end product of this Thermal decomposition of Sodium bicarbonate makes it usable for the above purpose?
• 054615 gigajoule] 24. Consider the following statements: 1. The space between the valence and conduction bands is zero in Graphene 2. This property of Graphene makes it an excellent transistor of commercial viability Which among the above statements is/ are correct?
• An antenna in a Geostationary satellite should have a minimum beam width of which among the following values to cover the entire earth?
• In which of the following light produces image focus in front of the retina?
• Consider the following statements: Both Cochlea and Vestibular system are parts of Internal ear Only Cochlea makes the auditory system of human body None of the malleus, incus, and stapes are found in the internal ear. Which among the above statements are correct ?
• Biologists have been able to demonstrate the hearing and sound sensory mechanism through the acoustico-lateralis system in which of the following vertebrates ?
• Now a days, a little pack of Silica Gel (granular beads of Silica made from Sodium Silicate) comes with many products to control humidity and avoid spoilage or degradation of some goods. Which among the following property of Silica gel makes it useful for that purpose?
• SOFAR is a phenomenon which plays an important role in submarine warfare & also known as deep sound channel. Which of the following is correct full form of SOFAR?
• The speed of Sound is maximum in which of the following ?