Knowledge Which of the following statements about waves is correct? a) Longitudinal waves propagate only through solids. b) Transverse waves displace particles in the direction of wave travel. c) Electromagnetic waves require a medium for propagation. d) Mechanical waves are a type of electromagnetic wave. The distance between two consecutive crests or troughs in a wave is called: a) Wavelength b) Frequency c) Amplitude d) Period Which of the following wave properties remains unchanged when a wave moves from one medium to another? a) Wavelength b) Frequency c) Speed [1) Amplitude The bending of waves around obstacles or through openings is known as: a) Reection b) Refraction c) Diffraction d) Interference Which of the following wave phenomena involves the superposition of two waves to produce regions of constructive and destructive interference? a) Diffraction b) Standing waves c) Polarization d) Doppler effect The phenomenon of an object resonating at its natural frequency when exposed to an external periodic force is called: a) Refraction b) Resonance c) Diffraction d) Interference Which type of wave does not require a medium for propagation? a) Longitudinal wave b) Mechanical wave c) Transverse wave d) Electromagnetic wave The speed of sound in a medium depends on: a) Frequency ofthe sound wave b) Wavelength of the sound wave c) Intensity of the sound wave d) Properties ofthe medium Which of the following statements about the Doppler effect is true? a) It affects only sound waves, b) It causes a change in the frequency of a wave source. c) It occurs only with stationary wave sources, d) It is not applicable to light waves. What is the relationship between the frequency and period ofa wave? a) They are directly proportional. b) They are inversely proportional. c) They are not related, d) The relationship depends on the wave type