1
AIEEE 2003
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Which of the following radiations has the least wavelength ?
A
$$\gamma $$ - rays
B
$$\beta $$ - rays
C
$$\alpha $$ - rays
D
$$X$$ - rays
2
AIEEE 2003
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
When a $${U^{238}}$$ nucleus originally at rest, decays by emitting an alpha particle having a speed $$'u',$$ the recoil speed of the residual nucleus is
A
$${{4\mu } \over {238}}$$
B
$$ - {{4\mu } \over {234}}$$
C
$$ {{4\mu } \over {234}}$$
D
$$ - {{4\mu } \over {238}}$$
3
AIEEE 2003
MCQ (Single Correct Answer)
+4
-1
The difference in the variation of resistance with temperature in a metal and a semiconductor arises essentially due to the difference in the
A
crystal structure
B
variation of the number of charge carries with temperature
C
type of bonding
D
variation of scattering mechanism with temperature
4
AIEEE 2003
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
A radioactive sample at any instant has its disintegration rate $$5000$$ disintegrations per minute. After $$5$$ minutes, the rate is $$1250$$ disintegrations per minute. Then, the decay constant (per minute) is
A
$$0.4$$ $$ln2$$
B
$$0.2$$ $$ln2$$
C
$$0.1$$ $$ln2$$
D
$$0.8$$ $$ln2$$
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