PHYSICS HIGH SCHOOL

When going from an optically less dense medium to a more optically dense medium (such as air to water), how does the angle of incidence compare with the angle of refraction? Does the light bend towards or away from the normal? What about from a more-dense medium to a less-dense medium (water to air)?

Answers

Answer 1

Answer:

Answer and Explanation:

When light goes from an optically rarer medium to an optically more dense medium, the bending of light takes place towards the normal.

In case, the light travels from air, i.e., less dense to water, i.e., optically more dense, then in accordance to Snell's law, the medium with the lower refractive index will have the larger angle whereas the medium with higher refractive index will have smaller angle.

Also, as light travels from a an optically less dense to optically more dense medium, speed of light reduces and hence its wavelength while the frequency remains intact.

Converse is true when light travels from an optically more denser to optically less dense medium, the light bends away from the normal, like in case of water to air, where water is comparatively more dense

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The change of energy from one form to another results in _____.

Answers

the spreading out of energy due to heat flow

A car travels from boston

Answers

A wise decision. Boston is a good place to be ... from.

A 60 W light bulb at 120 V is left on in your house to prevent burglary, and the power charges 10 cents per kilowatt-hour, how much will it cost to leave the bulb on for 30 days?

Answers

4.22 dollars is the cost to leave the bulb on for 30 days.

What is electrical energy?

Electrical energy is the power an atom's charged particles have to cause an action or move an object. The movement of electrons from one atom to another is what results in electrical energy.

There is a dissipation of electrical energy in the resistor when an electric current flows through it. It depends on the resistance of the resistor and the applied voltage.

The expression of the power dissipation is as follows ;

P= $(V^2)/(R)$

V is the applied voltage.

R is the resistance.

Given

P = 60 W

30days * 24h/day = 720 Hours kW * h

Therefore by putting the values in the given formula,

= (60/1000)kW * 720h

= 43.2 kWh

Hence,

The cost is 42.2 kWh42.2 kWh x 0.1

= 4.22 dollars

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In a nuclear power plant, _____. energy is released from the nuclei of atoms energy is released from the bonds of molecules energy is released from the electrons of atoms energy is stored in the nucleus of atoms

Answers

In a nuclear power plant, energy is released from the nuclei of atoms. The correct option among all the options given in the question is the first option. Huge amount of thermal energy is released by the breaking of the uranium atoms. This energy is used for turning a turbine that produces electricity. It is a very clean method of producing electricity.

Answer: energy is released from the nuclei of atoms

Explanation:

Chemical energy is the energy stored in the bonds of molecules.

Nuclear energy is the energy stored in the nucleus of the atom.

Nuclear power plants use heat produced during nuclear fission to heat water which is produced by the splitting of heavy nucleus into lighter elements by release of energy.

The complete nuclear fission reaction is:

$_(92)^(235)\textrm{U}+_0^1\textrm{n}\rightarrow _(56)^(143)Ba+_(36)^(90)Kr+3_0^1\textrm{n}$

A printer has a power of 100 W. It takes 30 seconds to print out a document. How much energy will ithave used?

Answers

A printer has power of 100 W, and it takes time of 30 seconds to print out the document, then the power consumed in 30 seconds will be 0.8333 W.

What is Power?

The quantity of energy moved or changed per unit of time is termed as power in physics. The watt, or one joule per second, is the unit of power in the International System of Units. Power is also referred to as activity in historical texts. A scalar quantity is power.

Power is connected to other factors; for instance, the power required to move a land vehicle is equivalent to the sum of the vehicle's velocity, traction force on its wheels, and aerodynamic drag.

Assuming the printer consumes electrical energy at a steady rate, then:

100 ÷ 60 = 1.6667 watts per minute.

Now, calculate the power consumed in 30 seconds,

1.6667 ÷ 2 = 0.8333 watts.

Therefore, the power consumed in 30 seconds will be 0.8333 watts.

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100W translates to 100 watts consumed in 1 hour. Assuming the printer consumes electrical energy at a steady rate, then: 100 ÷ 60 = 1.6667 watts per minute. 1.6667 ÷ 2 = 0.8333 watts consumed in 30 seconds.

A bus is traveling at 79.7 kilometers per hour east. How far does the bus travel in 1.45 hours?