Answer:
Like all other electromagnetic waves, radio waves travel at the speed of light in vacuum. Naturally occurring radio waves are emitted by lightning and astronomical objects. Radio waves are generated artificially by transmitters and received by radio receivers, using antennas.
Explanation:
Answer: 0.33 Hz
Explanation: from the question, the distance between two successive crest is wavelength = 20.9m and the ocean rise and fall through one complete cycle every 3.00s which is the period. Hence T = period = 3.00s
Frequency = 1/ period
Frequency = 1/3 = 0.33 Hz
"Twice each second" means "2 per second". <em>Frequency = 2 Hz.</em>
<em>Period </em>= time for one bounce = <em>1 second</em>
Amplitude = distance between "not stretched" and "greatest stretch".
<em>Amplitude = 10 centimeters</em>
Answer:2.617s
Explanation:note, a=g=acceleration due to gravity=9.81m/s2. It is negative when the ball is travelling upwards against gravity