PHYSICS HIGH SCHOOL

Sunlight is a form of electromagnetic energy.
a. True
b. False

Answers

Answer 1
Answer: It is true that sunlight is a form of electromagnetic energy. Electromagnetic energy is a form of radiant energy that released by electromagnetic radiation. One example of an electromagnetic radiation is the visible light. And visible light can be radio waves, infrared light and X - rays. The rays of the sun are a form of visible light. It has an electromagnetic radiation of UV (ultra violet) rays. That is why the radiation at day is greater than at day due to sun’s rays. 

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An automobile having a mass of 941 kg is driven into a brick wall in a safety test. The bumper behaves like a spring of constant 2.37 × 106 N/m and compresses 1.61 cm as the car is brought to rest What was the speed of the car before impact, assuming no energy is lost during impact with the wall? Answer in units of
If a material is ductile, it is most likely a ____________ . Question 24 options: A. Metalloid B. Noble Gas C. Non-Metal D. Metal E. Ion
Jake designed an experiment to demonstrate a solar eclipse. The steps of the experiment are listed below. Place a light bulb on a stand. Stick a pencil into a small styrofoam ball. Switch on the light bulb and darken the room. Stand with your back towards the light bulb. Hold the pencil with styrofoam ball in front of you at arm's length. Jake's experiment has a flaw. Which of these statements best describes a method to correct the flaw in Jake's experiment? A) Stand facing the light bulb. B) Replace the light bulb with a candle. C) Use a big globe instead of styrofoam ball. D) Clamp the styrofoam ball behind the light bulb.
When magnesium (Mg2+) and fluorine (F1-) combine in an ionic bond, the resulting formula will be A) Mg2F. B) Mg2F2. C) MgF. D) MgF2.
Which of the following statements is not true regarding atmospheric pressure?A. You calculate absolute pressure by adding atmospheric pressure to gage pressure. B. When atmospheric pressure is higher than the absolute pressure of a gas in a container, a partial vacuum exists in the container C. Mercury and aneroid barometers are used to measure atmospheric pressure. D. Atmospheric pressure increases with increasing altitude

What is the importance of the ozone layer?

Answers

Importanceofozonelayer:

  • The ozone shields the surface of the earth from ultraviolet UV radiation from the sun.
  • These radiations are highly damaging as they can cause cancer in both plants and animals, damage to eyes and immune system.
  • They can also lead to variations in global rainfall, ecological disturbances and dwingling of global food suppliers.

Explanation:

Formationofozonelayer:ozone at the higher level of the atmosphere is a product of UV radiations acting on oxygen O2 molecule. The higher energy UV radiations split apart some molecular oxygen( O2) into free oxygen (O) atoms.

Depletionodozonelayer:The amount of ozone in the atmosphere began to drop sharply in the 1980's . This decrease has been linked to synthetic chemicals like cholorofluorocarbons ( CFC's ) which are used as refrigerants and in fire extinguishers.

to protect us from the harmful UV rays from the sun so we don't become human bacon

What is the entropy change of 450 g of water when it changes from liquid to steam at its usual boiling point? For water, L_F = 0.334 MJ/kg, L_V = 2.26 MJ/kg.

Answers

Answer:

2726.54 J/K

Explanation:

Entropy change = (m* L_(v))/(T)

where

m = mass of water = 450g = 0.45kg

L_(v) = 2.26 MJ/kg = 2260000 J/kg

T = temperature at which water change from liquid to steam = 100 degree Celsius = 272 + 100 = 373 degree kelvin.

Entropy change = (0.4* 2260000)/(373) = 2726.54 J/K

What is the difference between mechanical waves and electromagnetic waves?

Answers

Answer:

D. A mechanical wave travels through matter, while an electromagnetic wave travels through empty space.

Explanation:
There is one major difference between electromagnetic waves and mechanical waves. Electromagnetic waves can travel through space and medium. Mechanical waves needs matter to transfer.

Which of the following substances are NOT formed by chemical bonds?A. mixture
B. molecule
C. compound
D. pure substance

Answers

Answer:

The answer is D. pure substance.

Explanation:

A pure substance is a particular class of homogeneous matter whose composition is fixed and chemically defined, that is, it has a stable chemical composition since it is a matter that remains chemically unaltered in its different states of aggregation, endowed with properties singular and characteristic. A pure substance is composed of entities such as molecules, formular units and atoms.
Pure substance becuase if it is pure it is not a bond

Wave X has an amplitude of 5 and wave Y has an amplitude of 4. What will happen when the crest of wave X meets the crest of wave Y?A crest with an amplitude of 1 will form.
A trough with an amplitude of 1 will form.
A crest with an amplitude of 9 will form.
A trough with an amplitude of 9 will form.

Answers

Answer: A crest with an amplitude of 9 will form.

Explanation:

From super position principle, we know that when two waves move in same medium meet, then the net amplitude of the super imposed waves is sum of amplitudes of individual waves.

A constructive superposition takes place when crest meets crest and crest is formed of higher amplitude or trough meets trough and forms trough of higher amplitude. A destructive superposition takes place when crest of one meets trough of other -a crest or trough can form depending on the larger amplitude of either.

In the given situation, crest of wave X meets crest of wave Y. The amplitude of the super imposed wave would be = 5 + 4 = 9 and a crest would form.
The right answer for the question that is being asked and shown above is that: "A crest with an amplitude of 9 will form." Wave X has an amplitude of 5 and wave Y has an amplitude of 4. the crest of wave X meets the crest of wave Y is that A crest with an amplitude of 9 will form.

How is 1 hectoliter different from 1 kiloliter?

Answers

For this case the main unit is liter.

The first thing you should know is that the liter is a unit of volume.

The difference then between hectoliter and kiloliter is the conversion factor.

For hectoliter we have:

1 hectoliter = 100 liters

For kiloliter we have:

1 kiloliter = 1000 liters

Answer:

The difference between both is the conversion factor:

1 hectoliter = 100 liters

1 kiloliter = 1000 liters
a kiloliter is smaller than hectoliter
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