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Genrish500 [490]
3 years ago
5

How do electromagnetic waves travel through a vacuum?​

Physics
1 answer:
Pepsi [2]3 years ago
6 0

Answer:

Due to this EM waves show electric and magnetic field. An electric and magnetic field have no need a medium to show thier effect. Hence in the presence of electric and magnetic field vector which vibrate perpendeculer to each other and get pertervation EM waves travels in vacuum.

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The fusion of deuterium and hydrogen is shown in the equation. fill in the missing number.
stellarik [79]

Answer:

= 2

Explanation:

During nuclear fusion, two lighter nuclei of elements combine to form heavy nucleus and also energy is released;

During the process of hydrogen fusion a nucleus of deuterium is formed from two protons with emission of a neutrino.

In this case deuterium fuses with hydrogen nuclei to form helium-3 and also release energy.

That is;

2/1 H + 1/1 H = 3/1 He + energy

8 0
3 years ago
Read 2 more answers
5. How many kilowatt-hours of energy would be used by a 40 W bulb that runs for 10 hours every
Nady [450]

Answer:

E = 0.4 kWh

Explanation:

Given that,

The power of a bulb, P = 40 W

Time, t = 10 hours

We need to find the energy used by the bulb. Let it is equal to E. So,

E=P\times t\\\\E=40\times 10\\\\E=400\ W-h\\\\or\\\\E=0.4\ kWh

So, 0.4 kWh of energy would be needed.

6 0
3 years ago
A 7.30-kg bowling ball is on a storage rack that is 1.12 m above
Marina CMI [18]

Answer:

80.12J

Explanation:

Given parameters:

Mass of the bowling ball = 7.3kg

Height of the storage rack  = 1.12m

Unknown:

Energy the ball would have exerted  = ?

Solution:

To solve this problem, the potential energy is the best parameter to use.

Potential energy is the energy due to the position of a body. It is expressed as:

    Potential energy  = mass x gravity x height

So;

   Potential energy = 7.3 x 9.8 x 1.12 = 80.12J

6 0
3 years ago
A 40-W lightbulb is 1.9 m from a screen. What is the intensity of light incident on the screen? Assume that a lightbulb emits ra
valentinak56 [21]

Answer:

INTNESITY = 0.88W/m^{2}

Explanation:

given data:

power P =  40W

Distance of light bulb from screen is  R  = 1.9 m

The light intensity considered as  the light energy falling on the surface per unit area per unit time

Intensity of light can be determined by using following formula

intesnity = \frac{P} {4\pi R^{2}}

intesnity = \frac{40} {4\pi *1.9^{2}}

INTNESITY = 0.88W/m^{2}

8 0
3 years ago
How do the valves do in the heart​
Rina8888 [55]

Answer:

The valves prevent the backward flow of blood. These valves are actual flaps that are located on each end of the two ventricles (lower chambers of the heart). They act as one-way inlets of blood on one side of a ventricle and one-way outlets of blood on the other side of a ventricle.

Explanation:

8 0
3 years ago
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