Subject :NSO Class : Class 9
Which of the following statements is/are correct?
I. Sound wave does not follow the same law of reflection as light does.
II. Tone is a sound of a single frequency while note is a mixture of several frequencies.
III. Infrasonic waves are used in SONAR.
IV. The numerical ratio of displacement to distance for a moving object is always less than one.
V. The value of acceleration due to gravity is least on equator.
AII only
BI, II and III only
CIV and V only
DII and V only
II is wrong, since note is the single frequency.