Q1: Define amplitude.
Ans. It is the maximum displacement of a vibrating body on one side.
Q2: What is called time period?
Ans. It is the time taken by a vibrating body to complete one oscillation.
Q3: Define frequency.
Ans. It is the number of vibrations produced by a vibrating body in one second.
Q4: What are ultrasonic waves?
Ans. It is the sound of frequencies more than 20000 hertz. We cannot hear such sounds.
Q5: The maximum displacement of an oscillating object is called the ……… .
Ans. Amplitude.
Q6:The number of oscillations per second made by the object is called the …….…. .
Ans. Frequency.
Q7: What do you mean by the term loudness?
Ans. The sound of high amplitude is called loudness.
Q8: Pendulum A makes 14 oscillations in five seconds and pendulum B makes 10 oscillations in three seconds. Which has a higher frequency? Express the frequency of each pendulum in hertz.
Ans.
Frequency of A = \(\frac{14}{5}\) = 2.8 hertz
Frequency of B = \(\frac{10}{3}\) = 3.33 hertz
Therefore, Pendulum B has higher frequency.
Q9: Define Hertz.
Ans. Frequency of a vibration or oscillation is measured in hertz. It is the unit of frequency.