1
KCET 2020
MCQ (Single Correct Answer)
+1
-0

During a $$\beta^{-}$$-decay

A
an atomic electron is ejected
B
an electron which is already present within the nucleus is ejected
C
a neutron in the nucleus decays emitting an electron
D
a proton in the nucleus decays emitting an electron
2
KCET 2020
MCQ (Single Correct Answer)
+1
-0

A radio-active elements has half-life of 15 years. What is the fraction that will decay in 30 years?

A
0.25
B
0.5
C
0.75
D
0.85
3
KCET 2019
MCQ (Single Correct Answer)
+1
-0

Which one of the following nuclei has shorter mean life?

KCET 2019 Physics - Atoms and Nuclei Question 18 English

A
A
B
B
C
C
D
Same for all
4
KCET 2019
MCQ (Single Correct Answer)
+1
-0

In Rutherford experiment, for head-on collision of $$\alpha$$-particles with a gold nucleus, the impact parameter is

A
zero
B
of the order of $$10^{-14} \mathrm{~m}$$
C
of the order of $$10^{-10} \mathrm{~m}$$
D
of the order of $$10^{-6} \mathrm{~m}$$
KCET Subjects
EXAM MAP