Answer:
Low Frequency, Long Wavelength, and Low Energy Transfer
Explanation:
Radio waves are on the larger(and lower frequency) side of the electromagnetic spectrum. These longer wavelengths mean that radio waves have a lower frequency because it takes longer for larger waves to travel. Therefore, less radio waves can travel a certain distance in a minute than a wave of a shorter wavelenght(and therefore lower frequency). Radio waves are considered a low-energy transfer wave. This is because they can be used in most environments for communication, air-traffic control, and broadcasting with little to no harm to the organisms around them. Even though radio waves can be found all around us, because they don't carry much energy, we aren't harmed by the radio waves.
The correct sequence of the events is the following:
1. Sputnik I was the first artificial Earth satellite. The Soviet Union's Sputnik 1 satellite took to the skies on Oct. 4, 1957.
2. NASA was formed - The National Aeronautics and Space Administration (NASA) agency was was created in 1958 from NACA (National Advisory Committee for Aeronautics)
3. The Soviet pilot and cosmonaut Yuri Alekseyevich Gagarin completed an orbit of the Earth on 12 April 1961.
4. The astronaut John Glenn orbits the Earth on February 20, 1962.
Neil Armstrong lands on the moon,
Answer:
a) We need to find p(x<68.15)
Standardize x to z, we have, z = (68.15-μ)/σ
=(68.15-57)/8.1
=1.38
Reading from standard normal tables,
p(z<1.38) =0.9162.
b) We need to find p(x>54.4)
Standardize x to z, we have, z = (54.4-μ)/σ
=(54.4-57)/8.1
=-0.32
Reading from standard normal tables,
p(z>-0.32) = 0.6255
