Class 9 Science - Chapter Sound NCERT Solutions | The frequency of a source of sound is 10
The frequency of a source of sound is 100 Hz. How many times does it vibrate in a minute?
The no. of oscillations produced in one second is called frequency .
Frequency of sound = 100 Hz
Total time = 1 min = 60 s
We know that,
Number of oscillations = Frequency × Total time
Number of oscillations/Vibrations = 100 × 60 = 6000
Therefore , the source vibrates 6000 times in a minute, producing a frequency of 100 Hz.
More Questions From Class 9 Science - Chapter Sound
- Q:-
Explain the working and application of a sonar.
- Q:-
Explain how sound is produced by your school bell.
- Q:-
Explain how defects in a metal block can be detected using ultrasound.
- Q:-
Distinguish between loudness and intensity of sound.
- Q:-
A sound wave travels at a speed of 339 m s-1. If its wavelength is 1.5 cm, what is the frequency of the wave? Will it be audible?
- Q:-
Which characteristic of the sound helps you to identify your friend by his voice while sitting with others in a dark room?
- Q:-
Which wave property determines
(a) loudness, (b) pitch? - Q:-
A sonar device on a submarine sends out a signal and receives an echo 5 s later. Calculate the speed of sound in water if the distance of the object from the submarine is 3625 m.
- Q:-
Explain how the human ear works.
- Q:-
How is ultrasound used for cleaning?
Popular Questions of Class 9 Science
- Q:-
Which of the following has more inertia: (a) a rubber ball and a stone of the same size? (b) a bicycle and a train? (c) a five-rupees coin and a one-rupee coin?
- Q:-
State the universal law of gravitation.
- Q:-
Which of the following are matter?
Chair, air, love, smell, hate, almonds, thought, cold, cold-drink, smell of perfume.
- Q:-
A force of 7 N acts on an object. The displacement is, say 8 m, in the direction of the force (Fig. 11.3). Let us take it that the force acts on the object through the displacement. What is the work done in this case?
- Q:-
What is meant by a pure substance?
- Q:-
In a reaction, 5.3 g of sodium carbonate reacted with 6 g of ethanoic acid. The products were 2.2 g of carbon dioxide, 0.9 g water and 8.2 g of sodium observations are in agreement with the law of conservation of mass.
sodium carbonate + ethanoic acid → sodium ethanoate + carbon dioxide + water
- Q:-
What are canal rays?
- Q:-
State any two conditions essential for good health.
- Q:-
How is our atmosphere different from the atmospheres on Venus and Mars?
- Q:-
Who discovered cells, and how?
Recently Viewed Questions of Class 9 Science
- Q:-
With the help of Table 4.1, find out the mass number of oxygen and sulphur atom.
- Q:-
What is the specific function of the cardiac muscle?
- Q:-
Complete the following table.
Atomic
NumberMass
NumberNumber
of
NeutronsNumber
of
ProtonsNumber
of
ElectronsName of
the Atomic
Species9 - 10 - - - 16 32 - - - Sulphur - 24 - 12 - - - 2 - 1 - - - 1 0 1 0 - - Q:-
Why does an object float or sink when placed on the surface of water?
- Q:-
Write down the formulae of
(i) sodium oxide
(ii) aluminium chloride
(iii) sodium suphide
(iv) magnesium hydroxide - Q:-
Compare the properties of electrons, protons and neutrons.
- Q:-
Write the electronic configuration of any one pair of isotopes and isobars.
- Q:-
What is the importance of universal law of gravitation?
- Q:-
Identify the solutions among the following mixtures.
(a) Soil
(b) Sea water
(c) Air
(d) Coal
(e) Soda water. - Q:-
Draw a labelled diagram of a neuron.
- All Chapters Of Class 9 Science
- All Subjects Of Class 9