choose the correct statements from the following: (i) sound is produced by vibrations. (ii) sound requires a…

choose the correct statements from the following: (i) sound is produced by vibrations. (ii) sound requires a medium for propagation. (iii) light and sound both require a medium for propagation. (iv) sound travels slower than light. a i & ii only b i, ii & iii only c ii, iii & iv only d i, ii & iv only

choose the correct statements from the following: (i) sound is produced by vibrations. (ii) sound requires a medium for propagation. (iii) light and sound both require a medium for propagation. (iv) sound travels slower than light. a i & ii only b i, ii & iii only c ii, iii & iv only d i, ii & iv only

Answer

Brief Explanations:

  • (i) Sound is indeed produced by vibrations. For example, a guitar string vibrating produces sound.
  • (ii) Sound needs a medium like air, water or solids to travel. In a vacuum, there is no sound as there are no particles to vibrate and carry the sound wave.
  • (iii) Light can travel through a vacuum (like from the sun to the earth through space), while sound cannot. So this statement is incorrect.
  • (iv) The speed of light in a vacuum is approximately $3\times10^{8}$ m/s, while the speed of sound in air is around 343 m/s at room - temperature. So sound travels slower than light.

Answer:

d. i, ii & iv only