Answer:
The earths magnetic field
Explanation:
Light travels in straight lines. Once a light has been produced, it will keep moving in a straight line until it hits something else. Shadows are evidence of light traveling in straight lines. An object blocks light so that it can’t reach the surface where we see the shadow.
Explanation:
(a) Frequency of radar energy, 
The relation between frequency and wavelength is given by :




or

(b) If wavelength, 




or
f = 1.2 GHz
Hence, this is the required solution.
Because sound waves don't travel through the vaccume of space. Hope this helped
Answer:
speed =wavelenght x frequency
v=4.5 x 10 to the -7 x 667=0.3 x 10 to the -4 m/s
speed= distance/time
time=distance/speed
t=4 x 10 to the 16/0.3 x 10 to the -4=13.33 x 10 to the 20 seconds
Explanation: