Answer:
For the first one, its B) cities B and C
I'm not so sure, but I hope this helps.
Which conditions I think you have place an incorrect image?
Frequency = (speed) / (wavelength)
Speed = 3 x 10⁸ m/s
Wavelength = 3 cm = 0.03 m
Frequency = (3 x 10⁸ m/s) / (0.03 m)
Frequency = (3 x 10⁸ / 0.03) (m / m-s)
Frequency = 1 x 10¹⁰ Hz (10 Gigahertz)
i think photons with shorter wavelengths have larger speed.
I apologise if its incorrect.
