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Ray Of Light [21]
3 years ago
9

Which is a correct comparison between the modern quantum model and John Dalton’s model of the atom?a. The modern model is not as

widely accepted by scientists as Dalton’s model.b. The modern model states that atoms of all elements are identical, whereas Dalton’s model does not.c. The modern model recognizes particles in the atom, whereas Dalton’s model does not.d. The modern model does not explain emission spectra, whereas Dalton’s model does.
Physics
1 answer:
Sonbull [250]3 years ago
3 0

Answer: c. The modern model recognizes particles in the atom, whereas Dalton’s model does not

Explanation:

The first atomic model was the one proposed by Jhon Dalton, according to which it is postulated that:  

<em>"Matter is made up of indivisible, indestructible and extremely small particles called atoms."  </em>

That is, <u>the atom is a solid and indivisible mass.</u>  

However, <u>according the modern model of the atom</u>, it is composed by particles. This means the atom is not indivisible as Dalton proposed.

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A bus leaves at 9 am with a group of tourists. They travel 350 km before they stop for lunch. Then they travel an additional 250
Anettt [7]

Average speed = Distance traveled / time taken

In this case Time taken = Difference in hours between 3 PM and 9 AM

                                        = 6 hours

Total distance traveled = 350 km + 250 km

                                       = 600 kilometers

So average speed = 600/6 = 100 km/hr

Average speed of bus = 27.78 m/s

So the bus's average speed = 27.78 m/s or 100 km/hr.

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3 years ago
Form conise note on heat energy specific heat application evaporation boiling sublimation relative humidity and dew point
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The answer is letter a

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3 years ago
What is the current in a series circuit that has two resistors (4.0 ohms and
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C 1.6 amps hipe this helps
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4 years ago
The velocity of blood flow is the lowest in capillaries because
Varvara68 [4.7K]

Answer:

the total cross-sectional area of the capillaries is greater than the total cross-sectional area of the arteries or any other part of the circulatory system.

Explanation:

Blood velocity is not the same in all areas. In the capillaries it is where there is less speed, while in arteries and veins it is quite similar. This is due to the cross-sectional area of ​​each of the vessels. It is a mistake to think of a vein, artery or capillary individually. We have to put them all together to see that the total area of ​​the capillaries is 100 times larger than that of the arteries or veins. Blood flowing through arteries or veins is going faster because there is less area.

Blood velocity is inversely proportional to each of the areas of its territories. The greater the area, the lower the speed.

6 0
3 years ago
Sonar is used to determine the speed of an object. A 38.0-kHz signal is sent out, and a 40.0-kHz signal is returned. If the spee
ANEK [815]

Answer:

The velocity is  v  =  8.743 \ m/s

Explanation:

From the question we are told that

    The frequency of the signal sent out  is  f_s  =  38.0 \ kHz  =  38.0 *10^{3} \ Hz

    The frequency of the signal received is  f_r  =  40.0 \ kHz  =  40.0 *10^{3} \ Hz

     The  speed of sound is  v_s  =  341 \ m/s

Generally the frequency of the sound received is  mathematically represented as

         f_r =  f_s  [\frac{v_s  + v}{v_s  - v} ]

where v is the velocity of the object

       =>      40 *10^{3} =  38 *10^{3} *   [\frac{341  + v}{341  - v} ]

       =>      1.05263 = \frac{341+v }{341-v}

       =>   358.94 - 1.05263v  =  341 + v

      =>    17.947 =  2.05263 v

      =>    v  =  8.743 \ m/s

7 0
4 years ago
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