When we change feeble sound to loud sound we increase its
(a) frequency
(b) amplitude
(c) velocity
(d) wavelength
1 Answers
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Why do we hear the sound produced by the humming bees while the sound of vibrations of pendulum is not heard?
Humming bees produce sound by vibrating their wings which is in the audible range. In case of pendulum the frequency is below 20 Hz which does not come in the...
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Establish the relationship between speed of sound, its wavelength and frequency. If velocity of sound in air is 340 m s–1, calculate
Derivation of formula v = ν λ. (i) 340 = 256 λ λ = 1.33 m. (ii) 340 = ν (0.85) ...
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Define the term ‘tone’. A person is listening to a sound of 500 Hz sitting at a distance of 450 m from the source of the sound.
Tone is the sound of single frequency. Given, Frequency, f = 500 Hz; Distance, s = 450 m Time period, T=? T = 1/ f = 1 /500 = 0.002s Therefore, the time interval will be 0.002...
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What will cause greater change in kinetic energy of a body? Changing its mass or changing its velocity.
As K .E = 1/2 mv2 therefore, K . E ∝ m K . E ∝ v2 Therefore, the change in velocity of a body will cause greater change in kinetic energy.
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Which condition out of the following will increase the evaporation of water? (a) Increase in temperature of water
(a) Increase in temperature of water
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In group 15 elements, there is considerable increase in covalent radius from N to P but small increase from As to Bi. Why ?
[Hint : Due to completely filled d- and/or f-orbitals in As, Sb and Bi.]
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Why does resistance of a metallic conductor increase with increase in temperature?
When a metallic conductor is heated, the atoms in the metal vibrate with greater amplitude and frequency. Due to increase in temperature, the thermal velocities of free electrons also increases....
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Melting of wax is a change where a solid changes to liquid state. Give one more such change which you observe in your surroundings.
Melting of ice. (Similar examples of such type may be given)
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A tuning fork sends sound waves in air. If the temperature of the air increases, which of the following parameters will change ?
(c) Wavelength . EXPLANATION: When the sound wave is being sent by a tuning fork, its displacement amplitude, frequency and the time period will remain the same even if the temperature changes....
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To increase the angular magnification of a simple microscope, one should increase
(b) the power of the lens
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