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3 years ago

A neutral atom of uranium (U) has 146 neutrons and a mass number of 238. How many protons does it have?

Physics

2 answers:

loris [4]3 years ago

6 0

Answer:

Explanation:

One

I've never heard of a mass defect before you asked this question. Interesting concept.

Givens

Number of neutrons =207 - 82 = 125

Number of protons = 82

The amu of a proton is 1.00728

The amu of a neutron is 1.00866

Solution

Find out the actual mass of the Lead atom

Actual mass = 82*1.00728 + 125*1.00866

Actual mass = 208.67946

The mass defect = 208.67946 - 207 = 1.67946

That is the proper way to calculate mass defect.

Apparently the way you are supposed to do it is

Mass defect = 208.67946 - 206.975897= 1.703563 which means that C is the closest answer. You will have to look at your notes to see if amu for protons and neutrons are what I used.

Two

The number of protons is the number of Uranium on the periodic table.

92 protons. 92 comes from the position on the periodic table.

You can get the same thing by Taking its relative mass (238) and subtracting the neutrons (146) which is 238 - 146 = 92

BARSIC [14]3 years ago

4 0

Answer:

92 protons

Explanation:

The mass number is 238 , so the nucleus has <u>238 particles</u> in total, including <u>146 neutrons</u>. So to calculate the number of neutrons we have to subtract: 238 − 146 = 92

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1 year ago

Is lateral shift or lateral displacement same ?

xxMikexx [17]

Answer:

When a ray of light passes through a glass slab of a certain thickness, the ray gets displaced or shifted from the original path. This is called lateral shift/displacement.

Explanation:

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3 years ago

A car stops in 120 m. If it has an acceleration of –5m/s 2 , how long did it take to stop

vova2212 [387]

Answer:

t=240s

Explanation:

Distance=120m

Acceleration=-5m/s^2

v=0

Let u=x m/s

Using equation v^2-u^2=2as:-

0-x=2(-5)(120)

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4 years ago

The diagram here shows an image being formed by a convex lens. Compared to the object at right, the image at left is-

natima [27]

Answer:

Smaller and upside down

Explanation:

To answer the question, we must recognise that the characteristics of the image formed by a convex lens depends on the position of the object from the lens.

From the diagram given in the question above, the following data were obtained:

1. The image is smaller than the object.

2. The image is inverted i.e upside down.

3. The image is closer to the lens

4. The image between 2f and f

Now, considering the options given in question above, the correct answer to the question is:

The image is smaller and upside down.

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3 years ago