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# Class 10 FRANK Solutions Physics Chapter 6 - Modern Physics - Exercises and MCQ

Get Physics learning support with our Frank Solutions for ICSE Class 10 Physics Chapter 6 Modern Physics Exercises and MCQ. Through our Frank Solutions, relearn Physics concepts such as isotopes, radioactive decay, radioactivity, gamma radiations etc. Understand the uses of radioactive isotopes in agriculture, industries and in the medical field.

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## Modern Physics - Exercises and MCQ Exercise 266

### Solution 1

(a) Mass number of copper = 63
Atomic number of copper = 29
As atomic number of element gives number of proton and electrons while mass number of element gives number of protons +number of neutrons.
So, number of protons in copper = atomic number of copper = 29.
Number of electron in copper = number of protons in copper =29.
Number of neutrons = mass number atomic number = 63 29 =34.
So answer is (iii) as copper contains 29 protons and 29 electrons. ## Modern Physics - Exercises and MCQ Exercise 267

### Solution 2 ### Solution 3

(a)    Electron has        (ii) a mass less than that of a proton.
(b)    Neutrons have     (iv) no electric charge.

### Solution 4 ### Solution 5 ### Solution 6

(a)Mass number of uranium = 235
Atomic number of uranium = 92
As atomic number of element gives number of proton and electrons while mass number of element gives number of protons +number of neutrons.
So, number of protons in uranium = atomic number of uranium = 92.
(b) Number of electron in uranium = number of protons in uranium =92.
(c)The atoms of same elements having the same atomic number Z but different mass number A are called isotopes. So, for another isotope of uranium mass number 235 changes.
(d)Number of protons in isotopes is same and as U238 is isotope of 92U235. So, number of protons in U235 is also 92.

### Solution 7 ### Solution 8

The atoms of same elements having the same atomic number Z but different mass number a are called isotopes. Hydrogen have 3 isotopes protium 1H1, deuterium 1H2, tritium 1H3.

### Solution 9 ### Solution 10 ### Solution 11 ### Solution 12 ### Solution 13

Following precautions should be taken while handling the radioactive substances.
(i)    The sources should only be handled by the forceps provided and never touched by hand.
(ii)    They should never be pointed towards a person.
(iii)    Food should not be taken where the sources are being used, as it may be contaminated.
(iv)    Never smoke near a radioactive source.

### Solution 14 ### Solution 15

The low temperature microwave radiation that arrives at the earth's surface from all directions of outer space is called background radiation.
(b)    Rocks in the earth which contain traces of radioactive substances.
(c)    Naturally occurring isotopes.