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3 years ago

Examine the scenario.

2 answers:

8 0

The answer is "A magnetic field influences the motion of charged particles. The negatively-charged particles will experience a force acting against their motion, so the negatively-charged particles would slow down and stop moving."

This is because for example;

Have you ever seen a magnet? If so, you would experience the same scienario as above.

aniked [119]3 years ago

5 0

Answer:

option (c)

Explanation:

According to the Fleming's left hand rule, if we spread out thumb, fore finger and middle finger of our left hand mutually perpendicular to each other, then thumb represents the direction of force, fore finger represents the direction of magnetic field and the middle finger represents the direction of current.

According to the question, positive charge particle moves in left wards direction, i.e., current is flowing towards left, the force is acting upwards, so the direction of magnetic field is in perpendicular outwards to the plane of paper.

When a negatively charged particle moves towards left , then the direction of force is downwards.

Thus, the magnetic field influences the motion of charged particles. The negatively-charged particles will experience a force downward because positive and negative particles would experience forces in opposite directions.

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A modern compact fluorescent lamp contains 1.4 mg of mercury (Hg). If each mercury atom in the lamp were to emit a single photon

Reika [66]

Answer:

A. 1.64 J

Explanation:

First of all, we need to find how many moles correspond to 1.4 mg of mercury. We have:

$n=\frac{m}{M_m}$

where

n is the number of moles

m = 1.4 mg = 0.0014 g is the mass of mercury

Mm = 200.6 g/mol is the molar mass of mercury

Substituting, we find

$n=\frac{0.0014 g}{200.6 g/mol}=7.0\cdot 10^{-6} mol$

Now we have to find the number of atoms contained in this sample of mercury, which is given by:

$N=n N_A$

where

n is the number of moles

$N_A=6.022\cdot 10^{23} mol^{-1}$ is the Avogadro number

Substituting,

$N=(7.0\cdot 10^{-6} mol)(6.022\cdot 10^{23} mol^{-1})=4.22\cdot 10^{18}$ atoms

The energy emitted by each atom (the energy of one photon) is

$E_1 = \frac{hc}{\lambda}$

where

h is the Planck constant

c is the speed of light

$\lambda=508 nm=5.08\cdot 10^{-7}nm$ is the wavelength

Substituting,

$E_1 = \frac{(6.63\cdot 10^{-34} Js)(3\cdot 10^8 m/s)}{5.08\cdot 10^{-7} m}=3.92\cdot 10^{-19} J$

And so, the total energy emitted by the sample is

$E=nE_1 = (4.22\cdot 10^{18} )(3.92\cdot 10^{-19}J)=1.64 J$

4 0

3 years ago

How does Electromagnetic Energy Travel?

alisha [4.7K]

Answer:

Perpendicular to the electric field and magnetic field

Explanation:

Electromagnetic waves are transverse waves composed by the perpendicular oscillating electric and magnetic fields.

EM waves have both Electrical and magnetic features.

they travel in the velocity of light (3*10⁸ ms⁻¹)

they does not require any media to travel. It has two perpendicular electric field and the magnetic field which are perpendicular to each other

They travel perpendicular to each of those electric and magnetic fields.

6 0

3 years ago

Metamorphic rocks are formed at high temperature and medium to low pressure

storchak [24]

Answer: are u kidding

Explanation:

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3 years ago

Help!!

scZoUnD [109]

If Fg=mg=ma and, Fg(planetX)=1/5Fg(earth)

then the time would be 5x of the time as gravity is acceleration. So 3.9s*5=19.5s

As the force of gravity is less, then the acceleration of masses is also less, therefore it will take more time for the object to fall by the factor of the force of gravity difference

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3 years ago

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Which of newton’s laws best explains why motorists should buckle up?

ivann1987 [24]

Newton's first law of motion.

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3 years ago