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FAQs on Past Year Paper, Physics (Set - 1), 2016, Class 11, Physics - Additional Study Material for NEET

1. What are the different types of waves in physics?
Ans. In physics, there are several types of waves. The most common types include mechanical waves, electromagnetic waves, and matter waves. Mechanical waves require a medium to propagate, such as sound waves or water waves. Electromagnetic waves, on the other hand, can travel through a vacuum and include radio waves, microwaves, visible light, and X-rays. Matter waves are associated with particles and exhibit wave-like properties, such as electrons in an atom.
2. How does the speed of light compare to the speed of sound?
Ans. The speed of light is significantly faster than the speed of sound. In a vacuum, such as outer space, light travels at a speed of approximately 299,792,458 meters per second (or about 186,282 miles per second). In comparison, sound travels through air at a much slower speed, approximately 343 meters per second (or about 767 miles per hour). This difference in speed is why we see lightning before we hear thunder during a storm.
3. What is the difference between velocity and acceleration?
Ans. Velocity and acceleration are both terms used to describe the motion of an object, but they represent different aspects. Velocity refers to the rate at which an object changes its position in a specific direction. It includes both the speed and the direction of motion. Acceleration, on the other hand, measures the rate at which an object's velocity changes. It can be positive (when the object's speed is increasing) or negative (when the object's speed is decreasing or changing direction).
4. What is the concept of conservation of energy in physics?
Ans. Conservation of energy is a fundamental principle in physics that states that energy cannot be created or destroyed, but it can only be transferred or transformed from one form to another. This means that the total amount of energy in a closed system remains constant over time. For example, if a ball is dropped from a certain height, its potential energy decreases while its kinetic energy increases. The sum of these two energies remains constant throughout the motion, demonstrating the conservation of energy.
5. What is the significance of Newton's laws of motion in physics?
Ans. Newton's laws of motion are three fundamental principles that describe the relationship between the motion of an object and the forces acting upon it. These laws are crucial in understanding the behavior of objects in motion and have wide-ranging applications in various fields of physics and engineering. The first law, known as the law of inertia, states that an object at rest will stay at rest, and an object in motion will continue moving with a constant velocity unless acted upon by an external force. The second law relates the acceleration of an object to the force applied to it and its mass. The third law states that for every action, there is an equal and opposite reaction. These laws provide a framework for analyzing and predicting the motion of objects in a wide range of scenarios.
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