Nuclei Test

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Nuclei Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

α -rays are

A
Helium nuclei

B
Lithium nuclei

C
Heavy nuclei

D
Hydrogen nuclei

Solution

Alpha particles consist of two protons and two neutrons bound together into a particle identical to a helium nucleus. They are generally produced in the process of alpha decay, but may also be produced in other ways. Alpha particles are named after the first letter in the Greek alphabet, α.
Question 2
1 / -0

β -rays and γ -rays are respectively

A
protons and neutrons of wavelengths shorter than X-rays

B
protons and electromagnetic radiation of wavelengths shorter than X-rays

C
neutrons and electromagnetic radiation of wavelengths shorter than X-rays

D
electrons and electromagnetic radiation of wavelengths shorter than X-rays

Solution

Beta ray is a high speed, high energy electron or positron emitted by the radioactive decay of an atomic nucleus during the processes of beta decay.
Gamma ray is a penetrating electromagnetic radiation arising from the radioactive decay of atomic nuclei
They both have high frequency than x -rays that's why they have shorter wavelength than x - rays.
Question 3
1 / -0

Law of radioactive decay is

A
N(t) = N (0) e^−t

B
N(t) = N(0)e⁴t²

C
N(t) = N(0)e²t²

D
N(t) = N(0)e^−λt

Solution

In a radioactive material, it is found that the radioactive decays per unit time are directly proportional to the total number of nuclei of radioactive compounds in the sample.
Question 4
1 / -0

The half-life T_1/2of a radionuclide is

A
the time in which N has been reduced to one-half of its initial value

B
the time in which N has been reduced to one-half of a standard fixed amount

C
the time in which N has been increased to double its initial value

D
none of these

Solution

Half life is the time at which remaining nuclei are half of initial nuclei. Half life describes how quickly unstable atoms undergo, or how long stable atoms survive, radioactive decay. It is used to characterize any type of exponential or non - exponential decay.
Question 5
1 / -0

Which rays are not deflected in electric and magnetic fields?

A
χ –rays

B
γ –rays

C
β –rays

D
none of these

Solution

γ –rays are chargeless particles that's why they are not deflected by electric and magnetic fields.
Question 6
1 / -0

A radioactive element X with a half life of 2 hours decays giving a stable element Y. After a time of t hours ratio of X to Y atoms is 1:7, then the value of t is

A
4

B
14

C
6

D
Between 4 and 6

Solution

X:Y = 1:7
Total Pairs = 8 = 2³
No of half lives (n) =3
t = n × T_1/2
t = 3 ×2 = 6
Question 7
1 / -0

An electric field can deflect

A
α –particle

B
Neutrons

C
χ rays

D
Gamma rays

Solution

Because alpha particles are charged species so they are deflected by electric fields.

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Nuclei Test - 5

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Question 1

Helium nuclei

Lithium nuclei

Heavy nuclei

Hydrogen nuclei

Solution

Question 2

protons and neutrons of wavelengths shorter than X-rays

protons and electromagnetic radiation of wavelengths shorter than X-rays

neutrons and electromagnetic radiation of wavelengths shorter than X-rays

electrons and electromagnetic radiation of wavelengths shorter than X-rays

Solution

Question 3

N(t) = N (0) e−t

N(t) = N(0)e4t2

N(t) = N(0)e2t2

N(t) = N(0)e−λt

Solution

Question 4

the time in which N has been reduced to one-half of its initial value

the time in which N has been reduced to one-half of a standard fixed amount

the time in which N has been increased to double its initial value

none of these

Solution

Question 5

χ –rays

γ –rays

β –rays

none of these

Solution

Question 6

4

14

6

Between 4 and 6

Solution

Question 7

α –particle

Neutrons

χ rays

Gamma rays

Solution

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N(t) = N (0) e^−t

N(t) = N(0)e⁴t²

N(t) = N(0)e²t²

N(t) = N(0)e^−λt