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3 years ago

6) Why do electromagnetic waves not require a medium for travel?

1 answer:

8 0

Electromagnetic waves are a type of
transverse wave. This wave does not
require media for travel. As the name
implies a wave, these waves indicate
electrical and magnetic properties. No
cost whatsoever happened to the wave. Electromagnetic waves work with the
laws of reflection and refraction. They
travel the straight line in a vacuum at a
speed of 3 x 108 ms-1. The intensity of
electromagnetic waves depends on the
strength of the electric field.

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Use Kepler's third law to determine how many days it takes a spacecraft to travel in an elliptical orbit from a point 6 965 km f

evablogger [386]

Answer:

0.0665 days

Explanation:

We are given;

The mean distance from the Earth's center to the moon;a1 = 385000 km

The mean distance from the Earth's center to the space craft;a2 = 6965 km

Formula for kepplers third law is;

T² = 4π²a³/GM

However, the proportion of both distances would be;

(T1)²/(T2)² = (a1)³/(a2)³

Where;

T1 is the period of orbit of the moon around the earth. T1 has a standard value of 27.322 days

T2 is the period of the space craft orbit.

Making T2 the subject, we have;

T2 = √((T1)²×(a2)³)/(a1)³)

Thus, plugging in the relevant values;

T2 = √(27.322² × 6965³)/(385000)³

T2 = 0.0665 days

6 0

3 years ago

Unpolarized light whose intensity is 1.46 W/m2 is incident on the polarizer in the drawing. (a) What is the intensity of the lig

Serhud [2]

Answer:

0.73 W/m²

0.2522 W/m²

Explanation:

$I_0$ = Unpolarized light = 1.46 W/m²

$\theta$ = Analyzer angle = 54°

Light through first filter

$I_1=\frac{I_0}{2}\\\Rightarrow I_1=\frac{1.46}{2}\\\Rightarrow I_1=0.73\ W/m^2$

The intensity of the light leaving the polarizer is 0.73 W/m²

After passing through analyzer

$I=I_1cos^2\theta\\\Rightarrow I=0.73\times cos^2(54)\\\Rightarrow I=0.2522\ W/m^2$

The intensity of the light that reaches the photocell is 0.2522 W/m²

6 0

3 years ago

A group of physicists perform an experiment. The measurements that they took were carefully made but they failed to obtain the c

koban [17]

The group of physicists that failed to obtain the correct measurements failed in obtaining accuracy.

<h3>What is accuracy?</h3>

Accuracy is the state of being accurate; being free from mistakes, this exemption arising from carefulness; exactness; correctness.

Mathematically, accuracy is the exact conformity to truth, or to a rule or model or a degree of conformity of a measure to a true or standard value.

According to this question, a group of physicists perform an experiment. Although the measurements that they took were carefully made, they failed to obtain the correct measurements.

This suggests that the group of physicists failed in obtaining accuracy.

Learn more about accuracy at: brainly.com/question/13099041

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6 0

2 years ago

.A formula that contains 2 elements is called a.

mr Goodwill [35]

Answer:

I think it is H2O . Formula of water

4 0

3 years ago

What is the mass of an object that has a weight of 80.0 N?