Which of the following statements about wave is not correct?
i. A wavefront is a line which contains all particles whose vibration are in phase.
ii. The direction of propagation of a wave is the link drawn parallel to the wavefront.
iii. A wavefront is a circle which is common to particles that are in the same state of disturbance
i only
ii only
i and ii only
i and iii only
ii and iii only
Correct answer is E
No explanation has been provided for this answer.
Which of the following remains unchanged as light travels from one medium to the other?
i. speed.
ii. wavelength.
iii. frequency.
i only
ii only
iii only
i and ii only
i and ii only
Correct answer is C
No explanation has been provided for this answer.
Which of the following is not a mechanical wave?
wave propagatd in stretched string
wave in closed pipe
radio waves
water waves
sound waves
Correct answer is C
No explanation has been provided for this answer.