Matric Notes Physics 10th Chapter 10 Simple Harmonic Motion and Waves Conceptual Questions

If you want to view other notes of Physics 10 Click Here. 

Physics 10th Chapter 10 Simple Harmonic Motion and Waves Conceptual Questions

 

10.1 If the length of a simple pendulum is doubled, what will be the change in its time period?

Ans: If the length of simple pendulum is doubled its time period will be:√2 T.

As we know that: Time period of simple pendulum

T=2π√(l/g)  ⟹  When l = 2l

Then T'=2π√(2l/g)  ⟹     T'=√2(2π√(l/g)) 

⟹   T'=√2 T

10.2 A ball is dropped from a certain height onto the floor and keeps bouncing. Is the motion of the ball simple harmonic? Explain.

Ans: No, the motion of the ball is not executing SHM. Because during the bouncing of ball mean position of not specified and it does not fulfill the conditions of simple harmonic motion.

10.3 A student performed two experiments with a simple pendulum. He/ She used two bobs of different masses by keeping other parameters constant. To his/ her astonishment the time period of the pendulum did not change! Why?

Ans: Time period of the simple pendulum is independent of mass. Time period of the simple pendulum does not change, with the change of mass, because it does not depend upon the mass of the body as: T=2π√(l/g)

10.4 What types of waves do not require any material medium for their propagation?

Ans: Electromagnetic waves do not require material medium to propagate.

10.5 Plane waves in the ripple tank undergo refraction, when they move from deep to shallow water. What change does occur in the speed of the waves?

Ans: The water waves enter into the region of shallow water, their wavelength decreases as given by the formula:  v = fλ As wavelength decreases, the speed of the wave also decreases.