Grade 12: SEMSTER 2 CHAPTER 2 WAVE MOTION

Q)Define a wave.

Wave is a disturbance that actually carries energy from one point to another with out the actual transfer of matter from one point to another

http://www.acs.psu.edu/drussell/Demos/waves/wavemotion.html

Differentiate between Transverse waves and longitudinal waves

Transverse Waves	Longitudinal Waves
The particles in the medium vibrate perpendicular to the direction of the wave velocity. (direction of energy propagation).	The particles in the medium vibrate parallel to the direction of the wave velocity (direction of energy propagation).

Consists of crests and troughs	Consists of compressions and rarefactions
Eg. Radio waves, light	Sound waves

Q1)

Ans. A

WAVE PROPERTIES

1. Displacement- (x)The distance to any point on the wave from the mean position at any point of time.

2.Amplitude (A) – Maximum displacement of particle of the medium from its equilibrium point. The bigger the amplitude, the more energy the wave carries.

3. Wavelength – Distance between two consecutive crests or two consecutive troughs.

4.Period (T) – Time taken by consecutive crests (or troughs) to pass a given point, i.e., the time required for one full cycle of the wave to pass by.

Time Period is the reciprocal of frequency: T = 1 / f.

5.Frequency (f ) – The number of cycles crossing a point in one second OR

The number of crests (troughs) crossing a point in one second

The SI unit for frequency is the Hertz (Hz), which is one cycle per second.