Ch-10: Simple Harmonic Motion and Waves

Ch-10: Simple Harmonic Motion and Waves

Here this post contains Short Question and Answers of Chapter 10 - Physics "Simple Harmonic Motion and Waves". Learn these question answers and other related stuff for exam preparation.

Simple Harmonic Motion or SHM can be defined as a motion in which the restoring force is directly proportional to the displacement of the body from its mean position. Understand SHM along with its types, equations and more.

Q-1:	What is the displacement of an object in SHM when K.E. and P.E. are equal?
Ans:	In simple harmonic motion when K.E. and P.E. are equal then the displacement will be the half of amplitude of vibrating body.
Q-2:	What is wave equation?
Ans:	The relation between the velocity, frequency and wavelength of wave is known as wave equation. i.e. v = f lamda
Q-3:	Think several examples of motion in every day life that are simple harmonic.
Ans:	Motion of pendulum clock Motion of Ball in bowl Motion of spring Motion of the prong of the tuning fork.
Q-4:	Difference between longitudinal and transverse waves with suitable example.
Ans:	Transverse waves: Waves in which particles of medium move perpendicular to the direction of propagation of waves are called transverse waves. Example: Water waves.
Q-5:	Define frequency?
Ans:	The number of vibration or cycle of a vibrating body in one second is called its frequency. It is reciprocal of time period i.g. f = I/T
Q-6:	Define simple harmonic motion?
Ans:	Simple harmonic motion occurs when the net force is directly proportional to the displacement from the mean position and always directed towards the mean position.
Q-7:	What is time period?
Ans:	The time taken by vibrating body to complete its one vibration is called time period. .It is denoted by T. Its unit is second.
Q-8:	Difference between mechanical and electromagnetic waves. Give examples of each.
Ans:	Mechanical waves: Wave which require any material medium for their propagation are called mechanical waves. Example: i. Water wave ii. Sound waves
Q-9:	Give relation between frequency and time period?
Ans:	The relation between frequency and time period is given below. f=I/T
Q-10:	How can you define term wave?
Ans:	Wave: A wave is disturbance in the medium which causes the particles of medium to undergo virbratory motion about their mean position in equal intervals of time.
Q-11:	Define amplitude?
Ans:	The maximum displacement of a vibrating body on either side from its mean position is called amplitude. OR the distance between mean position and extreme position is called amplitude.
Q-12:	What is meant by wave front?
Ans:	Wave front: The parts of waves where the motion of all particles of medium is same, these parts are called wave fronts. Example: Crests.
Q-13:	Define vibration?
Ans:	One complete round trip of vibrating body abut its mean position is called one vibration.
Q-14:	Describe the structure of ripple tank?
Ans:	Ripple tank consist of a rectangular tray having glass bottom and is placed nearly half meter above the surface of a table. Waves can be produced on the surface of water present in the tray by means of a vibrator.
Q-15:	Define refraction.
Ans:	When waves from one medium enter in the second medium at some angle their direction of travel may change.this phenomenon is called refraction of waves.
Q-16:	What is ripple tank?
Ans:	Ripple tank is a device to produce water waves and to study their properties. Like reflection, refraction and diffraction.
Q-17:	What is diffraction?
Ans:	The bending or spreading of waves around the sharp edges or obstacles is called diffraction.
Q-18:	What is reflection?
Ans:	When waves moving in one medium fall on the surface of another medium they bounce back into the first medium such that the angle or incidence is equal to the angle of reflection. This phenomenon is called reflection of waves.
Q-19:	Define vibratory motion. Give condition of vibratory motion.
Ans:	The to and fro motion of a body around its mean position is called vibratory motion, and the particle of the medium does not change their place. These are some conditions for vibratory motion. The motion is under the action of some restoring force Vibratory motion repeats itself after regular intervals of time it satisfies law of conservation of energy.
Q-20:	Define simple hair do about its mean position motion.
Ans:	The acceleration of the body executing S.HM is directly proportional to the displacement from the mean position and always directed towards the mean position
Q-21:	Write the properties of simple harmonic motion.
Ans:	i) A body always vibrate about its mean position  Acceleration is always directed towards mean position.  The Acceleration is directly proportional To the displacement and as a mean position and a is maximum t extreme position. TV Is maximum at man position and the prison
Q-22:	What is meant by time period?
Ans:	Time required to complete cone mound a tion is called time period
Q-23:	What are mechanical Waves?
Ans:	The waves which require some medium for their propagation are called mechanical waves, For example sound Waves water string waves
Q-24:	Define crest and trough of a wave
Ans:	Crest The point at which particle of a medium an above the normal position Trough: The point at which particle of the medium are below the normal position.
Q-25:	What is frequency? Write its unit.
Ans:	The number of waves passing through a point in one second is called frequency. Its unit 10. is cycle per Sec. Hertz (Hz) or vib/sec.
Q-26:	Define Hooke's law.
Ans:	The force applied on the spring directly is proportional to the increase in length is called 13. Hooke's law i.r. De 0X
Q-27:	What is meant by amplitude?
Ans:	The maximum displacement from mean position to extreme position durning vibratory 16. motion is called amplitude.
Q-28:	What are electromagnetic waves? Give examples
Ans:	The waves which do not require any medium for their propagation is called electromagnetic waves Example is radio waves. Heat. Television waves
Q-29:	Define compressional waves.
Ans:	The waves in which particles of the medium vibrate parallel to direction of propagation 22. of waves are called compressional waves.
Q-30:	What is reflection?
Ans:	The bouncing back of water waves after taking the burden is called reflection of waves and also obeys the laws of reflection of light.
Q-31:	Define refraction.
Ans:	When a ray of light caters from one transparent medium to another transparent medium it bends away from its path the bending of waves from the incident path is called refraction.
Q-32:	Define diffraction.
Ans:	The bending of waves around the corner or hurdles is called diffraction.
Q-33:	What is meant by interference?
Ans:	When the particles of the medium are subjected to two waves simultaneously the phenomenon takes place is called interference.
Q-34:	Define constructive interference.
Ans:	The interference in which crest of one wave fall on the crest of other wave or trough of  one fall on the trough of other wave. This is called constructive interference.
Q-35:	What is meant by destructive interference?
Ans:	The phenomenon in which crest of one wave falls on the trough of other wave, they cancel the each other effect and as a result surface of the medium remains undisturbed is called destructive interference.
Q-36:	Define stationary waves.
Ans:	When two identical waves pass through a medium along the same line in opposite direction then stationary waves are produced at certain Frequency.
Q-37:	Give an example, which explain that energy is transferred through waves.
Ans:	Example of such waves is sound waves i.e. sound energy is transferred from one medium to another medium in the form of waves.