Radioactive nuclei that are injected into a patient collect at certain sites within its body, undergoing radioactive decay and emitting electromagnetic radiation. These radiations can then be recorded by a detector. This procedure provides an important diagnostic tool called 

(1) Gamma camera

(2) CAT scan

(3) Radiotracer technique

(4) Gamma ray spectroscopy

Subtopic:  Radioactivity (OLD NCERT) |
 57%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints

A radioactive decay chain starts from Np93237 and produces Th90229 by successive emissions. The emitted particles can be 

(1) Two α-particles and one β-particle

(2) Three β+ particles

(3) One α particle and two β+ particles

(4) One α particle and two β- particles

Subtopic:  Radioactivity (OLD NCERT) |
 82%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

The half-life of a sample of a radioactive substance is 1 hour. If 8×1010 atoms are present at t = 0, then the number of atoms decayed in the duration t = 2 hour to t = 4 hour will be

(1) 2×1010         

(2) 1.5×1010

(3) Zero               

(4) Infinity

Subtopic:  Radioactivity (OLD NCERT) |
 72%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

Carbon dating is best suited for determining the age of fossils if their age in years is of the order of 
(1) 103            

(2) 104

(3) 105             

(4) 106

Subtopic:  Radioactivity (OLD NCERT) |
 57%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

A count rate meter shows a count of 240 per minute from a given radioactive source. One hour later the meter shows a count rate of 30 per minute. The half-life of the source is

(1) 120 min                   

(2) 80 min

(3) 30 min                     

(4) 20 min

Subtopic:  Radioactivity (OLD NCERT) |
 72%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

The half-life of a radioactive substance is 40 years. How long will it take to reduce to one fourth of its original amount and what is the value of decay constant 

(1) 40 year, 0.9173/year           

(2) 90 year, 9.017/year

(3) 80 year, 0.0173 year           

(4) None of these

Subtopic:  Radioactivity (OLD NCERT) |
 85%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

A radioactive material has a half life of 10 days. What fraction of the material would remain after 30 days

(1) 0.5               

(2) 0.25

(3) 0.125           

(4) 0.33

Subtopic:  Radioactivity (OLD NCERT) |
 85%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

Starting with a sample of pure Cu6678 of it decays into Zn in 15 min. The corresponding half-life is 

(1) 5 min               

(2) 712 min
(3) 10 min             

(4) 15 min

Subtopic:  Radioactivity (OLD NCERT) |
 81%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

A radioactive material has a half-life of 8 years. The activity of the material will decrease to about 1/8 of its original value in 

(1) 256 year           

(2) 128 year

(3) 64 year             

(4) 24 year

Subtopic:  Radioactivity (OLD NCERT) |
 84%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

A nucleus of mass 218 amu in free state decays to emit an α-particle. Kinetic energy of the α-particle emitted is 6.7 MeV. The recoil energy (in MeV) of the daughter nucleus is

(1) 1.0             

(2) 0.5

(3) 0.25           

(4) 0.125

Subtopic:  Types of Decay |
 64%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints