Question

please help me with this

Answer 1

5. Answer: 343.06m/s / 493.88Hz = 0.6946m = 69.46cm 
6. Answer: 3x108 msec-1/698.46 sec-1 = 4.295x105 m
9. Answer: 3x108 msec-1/783.99 sec-1 = 3.827x105 m


Tip: Try googling the questions online

Answer 2

Here's the help you need:

Speed = (wavelength) • (frequency)

This solves all of those problems.