What should Isla write in the areas marked A, B, and C?
2 answers:
Answer:
Radio waves: have a longer wavelength
X-rays: have a higher frequency
Both: they travel at the same speed
Explanation:
Missing part of the question:
"Isla made a diagram to compare x-rays and radio waves. what should isla write in the areas marked a, b, and c?"
X-rays and radio waves are both types of electromagnetic waves.
Electromagnetic waves consist of oscillations of the electric and the magnetic fields in a plane perpendicular to the direction of propagation the wave.
All electromagnetic waves travel in a vacuum always at the same speed, the speed of light:
Electromagnetic waves are also classified into 7 different types, according to their wavelength/frequency. From longest to shortest wavelength (and from lowest to highest frequency, since frequency is inversely proportional to wavelength), they are:
Radio waves (>1 m)
Microwaves (1 mm - 1 m)
Infrared (750 nm - 1 mm)
Visible light (380 nm - 750 nm)
Ultraviolet (10 nm - 380 nm)
X-rays (0.01 nm - 10 nm)
Gamma rays (<0.01 nm)
Therefore, the correct matches are:
Radio waves: have a longer wavelength
X-rays: have a higher frequency
Both: they travel at the same speed
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Answer:
15.75 m
Explanation:
First, let's look at the top brick by itself. In order for it not to tip over the bottom brick, its center of gravity must be right at the edge of the bottom brick. So the edge of the top brick must be 10.5 m from the edge of the bottom brick.
Now let's look at both bricks as a combined mass. We know the total length of this combined brick is 10.5 m + 21 m = 31.5 m. And we know that for it to not tip over the edge of the surface, its center of gravity must be at the edge. So the edge of the combined brick must be 31.5 m / 2 = 15.75 m from the edge of the surface.
