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2 years ago

Which of the following is a true statement?

Physics

2 answers:

Bad White [126]2 years ago

6 0

Answer:

c. Electromagnetic waves do not always need a medium to travel.

Explanation:

As the name suggests Electromagnetic waves consist of Electric and Magnetic fields.

Electromagnetic waves are transverse waves.

In a given medium Electromagnetic waves cannot vary in speed. However their wavelength and frequency can vary.

When an Electromagnetic wave travels through a medium It does not displace the medium. So, electromagnetic waves do not need a medium to travel.

forsale [732]2 years ago

4 0

C. Electromagnetic waves do not always need a medium to travel.

Since they are transverse waves they do not need a material medium.

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Thank you for spreading awareness!

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3 years ago

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A laser beam enters a 12.0 cm thick glass window at an angle of 33.0° from the normal. The index of refraction of the glass is 1

Alenkinab [10]

Answer:

The time is 0.563 ns.

Explanation:

Given that,

Index of refraction of glass = 1.41

Distance = 12.0 cm

Angle = 33.0°

We need to calculate the refraction angle

Using Snell's law

$n_{1}\sin\theta=n_{r}\sin\theta$

put the value into the formula

$1\times\sin33=1.41\sin\theta$

$\sin\theta=\dfrac{1\times\sin33}{1.41}$

$\theta=22.71^{\circ}$

We need to calculate the velocity of beam in glass

Using formula of velocity

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

Put the value into the formula

$v=\dfrac{3\times10^{8}}{1.41}$

$v=2.13\times10^{8}\ m/s$

We need to calculate the time

Using formula of distance

$v=\dfrac{d}{t}$

$t=\dfrac{12.0\times10^{-2}}{2.13\times10^{8}}$

$t=5.63\times10^{-10}\ sec$

$t=0.563\times10^{-9}\ sec$

$t=0.563\ ns$

Hence, The time is 0.563 ns.

6 0

2 years ago

QUESTION 5

Fiesta28 [93]

Answer:

D) sudden and irresistible on sets of sleep during normal waking periods

Explanation:

D because Narcolepsy (sudden and irresistible on sets of sleep during normal waking periods) is a part of insomnia

8 0

2 years ago

The path of a meteor passing Earth is affected by its gravitational force and falls to Earth's surface. Another meteor of the sa

Lina20 [59]

Answer: The correct answer is option (C).

Explanation:

As it is given in the problem, the path of a meteor passing Earth is affected by its gravitational force and falls to Earth's surface. Another meteor of the same mass falls to Jupiter's surface due to its gravitational force.

According to Newton's law of universal gravitational, every particle attracts every other particles in the universe with the gravitational force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.

The Jupiter is the most massive planet in the solar system. It is also the largest planet in the solar system. The gravity of Jupiter on its surface is 2.4 times that of surface gravity of the Earth.

If a person weighs 100 pounds on the Earth then he would weigh 240 pounds on Jupiter.

Therefore, the correct answer is option (C), the meteor falls to Jupiter faster due to its greater gravitational force.

8 0

3 years ago

Read 2 more answers

Two rockets are flying in the same direction and are side by side at the instant their retrorockets fire. Rocket A has an initia

lara31 [8.8K]

Answer:

-22.2 m/s²

Explanation:

The equation for position x for a constant acceleration a, time t and initial velocity v₀, initial position x₀:

(1) $x=\frac{1}{2}at^2+v_0t+x_0$