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## Simple Harmonic Motion

### Introduction:

Simple Harmonic Motion is a special type of periodic motion or oscillation where the restoring force is directly proportional to the displacement and acts in the direction opposite to that of displacement. Simple Harmonic motion is typified by the motion of a mass on a spring when it is subject to the linear elastic restoring force given by Hooke’s Law. The motion is sinusoidal in time and demonstrates a single resonant frequency. For simple harmonic motion to be an accurate model for a pendulum, the net force on the object at the end of the pendulum must be proportional to the displacement. This is a good approximation when the angle of the swing is small.

### Chapter Analysis:

This chapter happens to be one of the most interesting chapter from the entire NEET Syllabus. The last year had 3 question from this chapter. However, the question count had fallen down to 0 in 2016, 2013 and 2012. A total of 15 questions have been asked from this chapter in the past 11 years making it a low-weighted chapter. So, we should be expecting nothing more than 1-2 question from this chapter.
The below given graph will illustrate the above-mentioned analysis:

Year 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009
Questions 3 1 2 0 2 1 0 0 2 2 2

The important topics to be covered from this chapter are:
• Wave front and Huygen’s Principle
• Reflection and Refraction of Plane Wave at a plance surface using wave fronts
• Proof of Laws of Reflection and Refraction using Huygen’s Principle
• Interference – Young’s Double Slit Experiment and expression for fringe width
• Coherent Sources and Sustained Interference of Light
• Diffraction Due to Single Slit
• Width of Central Maximum

### Tips and Tricks:

2. Making Flash Cards and Flow Charts will help in quick revision
3. A List of important keywords with their meaning must be maintained
4. All the past year questions must be solved thoroughly

## Progressive Waves And Speed Of Mechanical Waves

### Introduction:

Waves move energy from one place to another. In a progressive wave the wave front moves through the medium. There are two types of waves, transverse and longitudinal. Transverse waves are waves where the displacement of the particles in the medium is perpendicular to the direction the wave is travelling in. Longitudinal waves are waves where the displacement of the particles in the same direction as the wave is travelling in.

### Chapter Analysis:

The last question that appeared directly from this chapter in the NEET paper was way back in 2009. The chapter has slipped from the eyes of the paper-setters in the past years. So, we should not be expecting anything from this chapter in terms of appearance of question.
The below given graph will illustrate the above-mentioned analysis:

Year 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009
Questions 0 0 0 0 0 0 0 0 0 0 1

The important topics to be covered from this chapter are:
• Wave Motion
• Transverse and Longitudinal Waves
• Speed of Wave Motion
• Displacement Relation for a Progressive Wave

### Tips and Tricks:

1. NCERT must be read properly for this chapter as it covers most of the topics briefly. Here is the link to the NCERT PDF version of the chapter:
2. Practice a large number of questions from this topic and leave no stones unturned to make this chapter one of your strengths.
3. Online video lectures might help the student in having a clearer understanding of the topic.

## Stationary Waves And Beats

### Introduction:

A standing wave, also known as a stationary wave, is a wave which oscillates in time but whose peak amplitude profile does not move in space. The peak amplitude of the wave oscillation at any point in space is constant with time, and the oscillations at different points throughout the wave are in phase. The locations at which the amplitude is minimum are called nodes, and the locations where the amplitude is maximum are called antinodes.

### Chapter Analysis:

The last question that appeared directly from this chapter in the NEET paper was way back in 2011 and 2010. The chapter has slipped from the eyes of the paper-setters in the past years. So, we should not be expecting anything from this chapter in terms of appearance of question.
The below given graph will illustrate the above-mentioned analysis:

Year 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009
Questions 0 0 0 0 0 0 0 0 1 1 0

The important topics to be covered from this chapter are:
• Principle of Superposition of Waves
• Reflection of Waves
• Standing Waves in Strings and Organ Pipes

### Tips and Tricks:

1. This is a tough chapter and will require hard labor. One should start with the NCERT to set the tone for further reading. Here is the link to the NCERT PDF version of the chapter:
2. Students must further look up for interactive animations as well as video lectures for more clearer understanding.
3. Mnemonics for the various steps must be created which will convert hard work to smart work.

## Interference And Organ Pipe

### Introduction:

Interference is a phenomenon in which two waves superpose to form a resultant wave of greater, lower, or the same amplitude. Constructive and destructive interference result from the interaction of waves that are correlated or coherent with each other, either because they come from the same source or because they have the same or nearly the same frequency. Interference effects can be observed with all types of waves, for example, light, radio, acoustic, surface water waves. The resulting images or graphs are called interferograms.

### Chapter Analysis:

A total of 7 questions have been asked from this chapter in the past 11 years. However, this chapter has evaded the eyes of the paper setters for the past two years. This chapter falls in the category of low-weighted chapter and hence we should not be expecting anything more than 1 question at max from this chapter.
The below given graph will illustrate the above-mentioned analysis:

Year 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009
Questions 0 0 1 1 1 0 2 1 0 0 1

### Tips and Tricks:

1. This is a tough chapter and will require hard labor. One should start with the NCERT to set the tone for further reading. Here is the link to the NCERT PDF version of the chapter:
2. Students must further look up for interactive animations as well as video lectures for more clearer understanding.
3. The diagrams must be understood completely and practiced every couple of weeks or so. Redrawing will help the student in remembering the parts exactly.
4. Mnemonics for the various steps must be created which will convert hard work to smart work.

## Doopler's Effect

### Introduction:

The Doppler Effect or the Doppler Shift is the change in frequency or wavelength of a wave in relation to an observer who is moving relative to the wave source. It is named after the Austrian Physicist, Christian Doppler, who described the phenomenon in 1842. The reason for the Doppler Effect is that when the source of the waves is moving towards the observer, each successive wave crest is emitted from a position closer to the observer than the crest of the previous wave. Hence, the time between the arrivals of successive wave crests at the observer is reduced.

### Chapter Analysis:

Although the previous year had no question being asked, the three years before that had one question being asked each and every time. The period of 2010-2015 was a drought regarding the number of questions from this chapter. With 4 questions in the past 11 years, this chapter falls in the category of low-weighted chapter and hence we should not be expecting much from this chapter, 1 question at max.
The below given graph will illustrate the above-mentioned analysis:

Year 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009
Questions 0 1 1 1 0 0 0 0 0 0 1

### Tips and Tricks:

1. This is a tough chapter and will require hard labor. One should start with the NCERT to set the tone for further reading. Here is the link to the NCERT PDF version of the chapter:
2. Students must further look up for interactive animations as well as video lectures for more clearer understanding.
3. Mnemonics for the various steps must be created which will convert hard work to smart work.

### Question for Simple Harmonic Motion(SHM) and Waves

• 1
• 2
• 3
• 4
• 5

#### Q. what are the important topics for JEE 2023 from SHM?

Wave front and Huygen