WINTER VACATIONS HOMEWORK

1. Complete your practical file. Write all the experiments of Physics and chemistry of Term II in your file.
2.Complete the assignments given in the class.
3. Prepare chapter 'Sound' and 'Work and Energy'

Very short answer type questions of chapter sound

ASSIGNMENT 2

1. Sound is considered as a mechanical wave. Give reason
2. Differentiate between
(a) wave and a pulse
(b) loudness and Intensity of sound
(c) a tone and a note
(d) Noise and Music
(e) Echo and Reverberation
3. Give a  relation between
(a) loudness and amplitude of a wave
(b) Intensity and Amplitude of a wave
(c) Time period and Frequency of a wave
(d) Velocity, wavelength and frequency of a wave
4. Ceilings of a concert halls are curved. Justify.
5(a). Name the unit in which Intensity of  a sound can be measured.
(b) Identify the characteritics on which loudness and Pitch of a sound depends.

ASSIGNMENT BASED ON CHAPTER SOUND

ASSIGNMENT --1

NUMERICALS
1.A person listening to a tone of 500 Hz sitting at a distance of 450m from the source of the sound.What is the  time between successive compressions from the source?(Given speed of sound in air =330m/s)
2. An echo returned in 3s. What is the distance of the reflecting surface from the source?(Given Speed of sound is 342m/s)
3. A ship sends out ultrasound that returns from the sea bed and it is detected  after 3.42s. If the speed of ultrasound through the sea water is 1531m/s, what is the distance of sea bed from the ship?
4. A person has a hearing range from 20 Hz to 20 KHz. What are the typical wavelengths of sound waves in air corresponding to these frequencies.(Given Speed of sound in air is 344m/s)
5. A submarine emits a SONAR pulse which returned from an underwater cliff in 1.02s. If the speed of sound in salt water is  1531m/s, how far away is the cliff?