Physics
(a) Name the time phenomenon involved in tuning a radio set to a particular station.
(b) Define the phenomenon named by you in part (a) above.
(c) What do you understand by loudness of sound?
(d) In which unit, is the loudness of sound measured?
Answer
(a) Resonance.
(b) When the frequency of the externally applied periodic force on a body is equal to it's natural frequency, the body begins to vibrate with an increased amplitude. This phenomenon is known as resonance. Resonance is a special case of forced vibration.
(c) Loudness is the characteristic by virtue of which a loud sound can be distinguished from a faint one, both having the same pitch and quality.
(d) The unit of loudness is phon. The level of sound is expressed in decibel (dB)
Related Questions
A nucleus 11Na24 emits a β-particle to change into magnesium (Mg).
(a) Write the symbolic equation for the process.
(b) What are numbers 24 and 11 called?
(c) What is the general name of 1224Mg with respect to 1124Na
A student stands 330 m from a tall cliff which is 990 m from another tall cliff.
The student fires a pistol and hears some echoes. If the speed of sound between the cliffs is 330 m/s,
(a) What is the time taken by first echo to reach the student?
(b) Find the time interval between the first echo and the second echo.
Three resistors Of 5 Ω, 10 Ω and 15 Ω are connected in series with a 12 V power supply.
(a) Calculate their combined resistance and the current that flows in the circuit and in each resistor.
(b) Find the potential difference across each resistor.
(a) Draw a schematic diagram of main circuit.
(b) Define conductivity.
(c) Of the three connecting wires in a household circuit, which two of the three wires are at the same potential?