Embibe Experts Solutions for Chapter: Sound, Exercise 1: Exercise

Study the graphic depicting the range of frequencies different animals can hear. Which of the options correctly depicts the animals having the highest audible range of frequencies?

Note that the horizontal scale is not a linear scale.

The sound wave is a longitudinal wave. Longitudinal waves are those waves in which the particles of the medium vibrate parallel or antiparallel along the direction of propagation of the wave. The longitudinal wave travels with the formation of 'rarefactions' and 'compressions'. Compression is the part of the wave in which the particles of the medium are closer than they normally are. Here, the density of the medium is more than the normal density and volume decreases momentarily. Rarefaction is that part of the wave in which the particles of the medium are farther apart than they normally are. Here, the density of the medium is less than the normal density and the volume increases momentarily. 

In the figure given, compared to wave P, wave Q would be _____.

Earlier, remote control devices used a particular range of frequency. This range was withdrawn because these frequencies were heard by dogs, though not by human beings. Which of the following frequency ranges would have been earlier used in a remote control device?

The frequency range in which some common animals can hear is shown in the graphic below. A manufacturer wants to create a pest controller that will emit loud sounds that can be heard by insects and rodents (and will hence drive them away), but will not affect humans and pets. What frequencies of sound should the pest controller produce?

Raghu is part of a classical music band. He plays the tabla in the band. While practising, the band adjusted their instruments. How will Raghu adjust the pitch of the tabla to match with the other instruments in the band?

While drinking a soft drink, Ram starts blowing into the mouth of the bottle and finds that it makes a sound. He challenges his friend Riya to make a sound of the same pitch using her bottle, which was smaller in size. In which of these arrangements will that happen?

Pooja and her friends collected the information about the audible range for different animals. Which of these animals could communicate with each other at a frequency greater than $70,000 \mathrm{hertz}$ so that they are not heard by their predators?

During the class prize-giving ceremony, Anand clapped his hands hard while Kumar clapped his hands softly. Everybody could hear Anand's clapping while only a few could hear Kumar's clapping. This was because the sound produced by Anand was of