"electromagnetic spectrum/read-and-respond/?assig Radio waves have wavelengths that can be as long as a football field. They travel to Earth
from places like the sun and Jupiter. Radio waves have the longest wavelength, lowest
frequency and lowest energy. They are used in communication for technology like cell
phones, radio and television. Radio waves aren't sound waves, so you can't actually hear
them. There are charged particles in the Earth's atmosphere that reflect radio signals. The
waves carry signals thousands of miles to a receiver that converts that signal to sound.
Which of the following correctly describes how radio waves are transmitted and
converted into sound?
А
1. Waves convert radio signals into sound.
2. Particles in Earth's atmosphere carry sound.
3. Receivers reflect the sound.
1. Receivers carry radio signals.
2. Particles in Earth's atmosphere reflect the signals.
3. Waves convert the signals into sound.
1. Waves carry radio signals.
2. Receivers convert them into sound.
3. Particles in Earth's atmosphere reflect the sound.
1. Waves carry radio signals.
2. Particles in Earth's atmosphere reflect them.
3. Receivers convert them into sound.
с
D

Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. which one, if either is correct? a. beryl, because low thermal conductivity results in low heat transfer. b. beryl, because low thermal conductivity results in high heat transfer. d. sapphire, because low thermal conductivity results in high heat transfer. e. neither, because low heat transfer is desirable both in summer and in winter.

The inside surface of a cylindrical-shaped cave of inner diameter 1.0 m is continuously covered with a very thin layer of water. the cave is very long and it is open on both ends. the water on the cave surface is at a constant temperature of 15.5 °c. the cave is constantly exposed to wind such that 15.5 °c air flows through the cave at 4.5 m/s. the kinematic viscosity of the air is 14.66 x 10-6 m2/s and the molecular diffusion coefficient of water vapor in the air is 0.239 x 10-4 m2/s. because the cave diameter is so large, the flow of wind down the length of the cave, in the x direction, can be treated like it is external flow and the cave surface can be approximated as flat where appropriate. calculate the x value, in a) the transition to turbulent flow occurs at rex meters, where the air flow transitions from laminar to turbulent along the inside surface of the cave b) calculate the x value, in meters, where the bulk steady state concentration of water vapor in the air flowing in the cave is 10% of the saturation concentration. assume the air at the surface of the water layer is 100% saturated with water vapor. assume the wind entering the cave contained no moisture before it entered the cave. take into account the transition from laminar to turbulent flow when solving part b

Explain the difference in reactivity of the elements based on their electron configurations.