Match the following with respect to waves:

	Column – I		Column – II
a.	Frequency	(p)	Linear distance travelled by a wave per unit time.
b.	Wavelength	(q)	Number of waves passing through a point per unit time.
c.	Wave number	(r)	Linear distance between starting and end point of one complete wave.
d.	Speed	(s)	Number of waves contained in a unit length.

	a	b	c	d
1.	q	p	s	r
2.	s	r	q	p
3.	q	r	s	p
4.	s	p	q	r