The first model of an atom was a simple, neutral sphere.

2 answers:

7 0

<span>Thomson proposed in 1898 a new model, according to which the atom would be a massive sphere whose mass corresponded almost to the total mass of the atom itself. In this sphere would be the negatively charged electrons. As the atom was electrically neutral, Thomson stated that the matter constituting the sphere was positively charged.</span>

andre [41]3 years ago

3 0

Because he found that electrons are negatively charged particles, seperate from the positively charged nucleus, although his model was still incorrect

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Venn diagrams are used for comparing and contrasting topics. The overlapping sections show characteristics that the topics have

natulia [17]

Answer:

B.The slinky descriptions of motion are switched.

Explanation:

First of all, let's define the two types of wave:

- Transverse wave: in a transverse wave, the oscillation of the wave occurs in a direction perpendicular to the direction of propagation of the wave. An example of transverse wave are electromagnetic waves.

- Longitudinal wave: in a longitudinal wave, the oscillation of the wave occurs in a direction parallel to the direction of propagation of the wave. An example of longitudinal wave are sound waves.

According to these definitions, we notice that the following descriptions of motion must be switched:

- "Like moving a spring up and down" --> this better describes a transverse wave, because the motion up/down is perpendicular to the direction of the spring

- "Like moving a spring back and forth" --> this better describes a longitudinal wave, because the back/forth motion is parallel to the direction of the spring

4 0

4 years ago

Read 2 more answers

A 2. 0mc charge in an external field of 20n/c, north (direction) will experience a force of: ___0. 04____________ newtons, the d

sleet_krkn [62]

2. 0 mc charge in an external field of 20n/c, north (direction) will experience a force of 0.4 newtons, the direction of the force is north

Force in an electric field = charge * electric field

given

charge = 2* $10^{-3}$ C

electric field = 20 N/C

Force in an electric field = 2* $10^{-3}$ * 20

= 0.04 N

since , external field is in north direction then the force must be in north direction because the direction of an electric field at a point is the same as the direction of the electric force acting on a positive test charge

hence, 2. 0 mc charge in an external field of 20n/c, north (direction) will experience a force of 0.4 newtons, the direction of the force is north

learn more about electric field

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5 0

2 years ago

When dealing with the conservation of momentum, does direction matter?

allochka39001 [22]

Answer:

Momentum is conserved in all three physical directions at the same time.

Explanation:

There is a peculiarity, however, in that momentum is a vector, involving both the direction and the magnitude of motion, so that the momenta of objects going in opposite directions can cancel to yield an overall sum of zero.

5 0

3 years ago

The energy per unit volume in an electromagnetic wave is: ________

Marianna [84]

Answer:

Explanation:

Electromagnetic waves are waves that are generated when an electric field and a magnetic field vibrate together. They are usually created whenever an electric field collides with a magnetic field.

In more generic terms for an electric field, the energy per unit volume is given by:

Energy density = $\dfrac{1}{2}\varepsilon _oE^2$