PHYSICS HIGH SCHOOL

What branch of physics best explains the photoelectric effect?A.) nature of light
B.) general relativity
C.) law of conservation of momentum
D.) thermodynamics

Answers

Answer 1
Answer: i think its nature of light

Related Questions

What is the voltage of a circuit when 5C of charge flows with a 7V EMF?
Why is it useful to create neptunium by bombarding uranium with protons even though neptunium disintegrates in about two days?
A force is applied to a 30-kg object, resulting in an acceleration of 15 m/s. What is the force being applied to the object?
A baseball has a mass of 140 grams and a softball has a mass of 280 grams. In which of the following situations would they both have the same momentum?
Which situation results in the most attraction between two magnets?A. The north pole of one magnet is near the south pole of the othermagnetB. The north pole of one magnet is far away from the north pole ofthe other magnet.C. The north pole of one magnet is far away from the south pole ofthe other magnet.D. The south pole of one magnet is near the south pole of the othermagnet

One consequence of Einstein's theory of special relativity is that mass is a form of energy. This mass-energy relationship is perhaps the most famous of all physics equations: E=mc2,
where m is mass, c is the speed of the light, and E is the energy. In SI units, the units of speed are m/s. For the preceding equation to have consistent units (the same units on both sides of the equation), the units of E must be which of the following?

Answers

Answer:

Unit of energy is kg-m/s or Joules.

Explanation:

The mass- energy relationship in physics is given by :

E=mc^2

Where

m is the mass of the object

c is the speed of light

The SI unit of m is kilogram while the SI unit of c is as same as speed of light i.e. m/s. So, the unit of energy is kg-m/s. It is also equivalent to Joules.

So, the SI unit of energy is kg-m/s or Joules. Hence, this is the required solution.
Joule is the si unit for energy

Which of the following represents a chemical change to matter? A. digestion of food B. melting an ice cube C. shredding paper D. crushing an ice cube

Answers

The answer is A. digestion of food. The chemical change to matter means that the molecule structure has been destroyed. For B, C and D. the matter are still ice, paper and ice. So they are physical change.

A drowsy cat spots a flowerpot that sails first up and then down past an open window. The pot is in view for a total of 0.66 s, and the top-to-bottom height of the window is 1.80 m. How high above the window top does the flowerpot go? (Assume that in both sailing upward and then falling downward, the flowerpot is seen to span the full vertical height of the window.)

Answers

Answer:

Height covered after crossing window top = 0.75 m

Explanation:

In the question,

The height of the window pane = 1.8 m

Time for which the flowerpot is in view = 0.66 s

So,

The time for which it was in view while going up is = 0.33 s

Time for which it was in view while going down = 0.33 s

So,

Let us say,

The initial velocity of the flowerpot = u m/s

So,

Using the equation of the motion,

s=ut+(1)/(2)at^(2)\n1.8=u(0.33)-(1)/(2)(9.8)(0.33)^(2)\n1.8=0.33u-0.5336\n0.33u=2.33\nu=7.07\,m/s

So,

Velocity at the top of the window pane is given by,

v=u+at\nv=7.07-(9.8)(0.33)\nv=3.836\,m/s

Now,

Let us say the height to which the flowerpot goes after crossing the window pane is = h

So,

Using the equation of motion,

v^(2)-u^(2)=2as\n(0)^(2)-(3.836)^(2)=2(-9.8)h\nh=(14.714)/(19.6)\nh=0.75\,m

Therefore, the height covered by the flowerpot after window is = 0.75 m

The earth system concept emphasizes which of the following? Question 2 options: how everything on the earth is interconnected how you can study each system in isolation the concept that the earth is round how the earth's systems came about

Answers

The earth system concept emphasizes on how everything on the earth is interconnected. Earth system in terms of four central components known as the subsystems – the hydrosphere,geosphere, atmosphere and biosphere. I hope the answer helps. Thanks! 

The work done in lifting an apple one meternear Earth’s surface is approximately
(1) 1 J (3) 100 J
(2) 0.01 J (4) 1000 J

Answers

Answer: Option 1: 1 J

Explanation:

Average mass of an apple is between 60 g to 200 g It is not greater than this.

We can take an average mass, m =130 g

This average mass approximation would not affect the final answer.

The work done in lifting any object is given by:

W = m g h

Where, m is the mass of the object, g is the acceleration due to gravity and h is the height to which the object is lifted.

It is given that, h = 1 m

g = 9.8 m/s²

m = 130 g = 0.13 kg

⇒W =0.13 kg×9.8 m/s²×1 m = 1.3 J ≈ 1 J

Thus, the work done in lifting an apple one meter  near Earth’s surface is approximately 1 J
If we take an apple of mass 0.1Kg, assuming that the gravitational acceleration is g=10m/s^2, we get W=1*0.1*10=\boxed{1J}

Which of the statement below best explains the reason why scientific ideas lack scientific consensus? A. They are already laws. B. Theyre are new ideas. C. They are not accepted by the public. D. They are not published in an encyclopedia.

Answers

"They are new ideas" is the statement among the choices given in the question that best explains the reason why scientific ideas lack scientific consensus. The correct option among all the options that are given in the question is the second option or option "B". I hope that the answer has come to your help.

Answer:

B. They are new ideas

Explanation:

Here is how a scientific idea is accepted:

First a researcher presents the idea and its proof to the scientific community in the form of a scientific paper via the submission to a journal.

This paper then is reviewed by the experts in the field. If the results seem acceptable to them then it is published in the journal.

Now, the acceptance of the paper depends on the number of citations the paper gets.

When there is a new idea which is accepted they are unknown to the scientific community. As the paper gets older the number of people who have read the paper increases and if they think it is right then the idea gains consensus.
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