3 years ago

Which statement demonstrates that ultraviolet (UV) rays are electromagnetic waves?

Physics

2 answers:

MA_775_DIABLO [31]3 years ago

5 0

The answer is B) They do NOT require a medium to travel.

aalyn [17]3 years ago

4 0

B. They don't require a medium to travel

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According to the law of universal gravitation, any two objects are attracted to each other. The strength of the gravitational fo

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C. Planet A orbits its star faster than Planet B.

Explanation:

since Planet A is closer to the star due to its gravitational force, it will orbit its star faster than planet B

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3 years ago

A. How long does it take light to travel through a 3.0-mm-thick piece of window glass?

hodyreva [135]

Answer:

a) $1.517\times10^{-11}$ s

b) 3.41 mm

Explanation:

We take the speed of light, c = $3.0\times10^8$ m/s and the refractive index of glass as 1.517.

Speed = distance/time

Time = distance/speed

Refractive index, n = speed of light in vacuum / speed of light in medium

$n=\dfrac{c}{s}$

$s=\dfrac{c}{n}$

$t=\dfrac{d}{c/n}$

$t=\dfrac{dn}{c}$

$t=\dfrac{3\times10^{-3}\times1.517}{3.0\times10^8}$

$t=1.517\times10^{-11}$

We take the refractive index of water as 1.333.

Speed in water = speed in vacuum / refractive index of water

Distance = speed * time

$d=s\times t$

$d=\dfrac{c}{n_w}\times \dfrac{3\times10^{-3}\times1.517}{c}$

$d=\dfrac{3\times10^{-3}\times 1.517}{1.333}$

d = 3.41 mm

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4 years ago

A medieval instrument used to determine the position of the sun:

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Answer: astrolabe

Explanation:

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2 years ago

According to Newton's 3rd Law, an object's momentum depends on it's velocity and mass. 4 dog-sled teams competed to see who coul

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C.) Sled Team C 28 kg moving at 12m/s

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3 years ago

A sled that has a mass of 8 kg is pulled at a 50 degree angle with a force of 20 N. The force of friction acting on the sled is

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Answer:

a = 1.3 m/s2; fn = 63.1 n :)

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3 years ago