Question No.2
speed= distance/ time
1200km/0.006s= 200 000 km/s
Question 4
wavelength = wavespeed / frequency
wavespeed = 16/8 = 2
Question 5
(400/60s) = 6.6667 waves/ sec (Hz).
Velocity = 0.008m/sec.
Wavelength = (v/f) = 0.008/6.6667 = 0.0012 metre (1.2mm).