Q: Define simple harmonic motion.
Ans: The motion in which acceleration of the body is directly proportional to displacement and always directed towards the mean position is called simple harmonic motion.
Q: How will you define wave motion?
Ans: The motion which is due to the generated disturbance which causes the constituent particles to repeat its to and fro motion about its mean position in equal interval of time, and this disturbance is passed over from one end to the medium to the other.
Q: What are transverse waves?
Ans: Transverse waves are such waves in which the particles of the medium vibrate perpendicular to the direction o propagation of the wave.
Q: What are compressional waves?
Ans: The wave in which the direction of the vibratory motion of the particles of medium is parallel to the direction of propagation of wave are called compressional or longitudinal waves.
Q: Write four properties of waves?
Ans: The four properties of waves are:
I. Reflection ii. Refraction iii. Diffraction iv. Interference
Q: What is meant by crest and trough?
Ans:
Crest: Those parts of the transverse waves where the particles of medium are above the normal position are called trough.
Trough: Those parts of the transverse waves were the particles of the medium are below their normal position are called trough.
Q: What is the necessary factor for Diffraction?
Ans: Diffraction of waves can only be observed clearly if the size of the slit or obstacle in nearly equal to the wavelength of the wave.
Q: What is difference between the amplitude and displacement of a vibrating body?
Ans: Amplitude in the maximum distance of a vibrating body from the mean position, while the distance of vibrating body form mean position at any time is called as displacement.
Q: What do you mean by time period?
Ans: The time required to complete one vibration or cycle is called as time period. It is denoted by “T” . Its unit is second (S).
Q: Write down any two characteristics of S.H.M.
Ans:
(i) A body executing simple harmonic motion, always vibrates about its mean position.
(ii) Its acceleration is always directed towards its mean position.
(iii) Velocity is maximum at the mean position and zero at the extreme position.
Q: What do you mean by compressional wave?
Ans: A wave of continuous compression and rarefaction moving away from the vibrating body is called compressional wave. A wave of continuous compression and rarefaction moving away from the vibrating body is called compressional wave. A wave of continuous compression and rarefaction moving away from the vibrating body is called
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