When the temperature lowers the plants can freeze and die. One way to prevent that is to cover the plants so they dont freeze
The carrier frequency remains constant during amplitude modulation. :)
Answer:
v = 16.98 km/s
Explanation:
Given that,
Distance, d = 4500 km
Time, t = 265 s
We need to find its average speed. The total distance covered divided by total time taken is called average speed of an object. So,

So, the average speed is 16.98 km/s.
B is the correct answer
y=Asin(wt-kx)
A=amplitude
f=frequency
x=wavelength
since refraction is not on the wave formula,then option B is the correct answer