1
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
Change Language
At the first minimum adjacent to the central maximum of a single-slit diffraction pattern, the phase difference between the Huygen's wavelet from the edge of the slit and the wavelet from the midpoint of the slit is
A
$$\pi $$ radian
B
$${\pi \over 8}$$ radian
C
$${\pi \over 4}$$ radian
D
$${\pi \over 2}$$ radian
2
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
Change Language
The energy of the em waves is of the order of 15 keV. To which part of the spectrum does it belong ?
A
Ultraviolet rays
B
$$\gamma - rays$$
C
X-rays
D
Infra-red rays
3
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
Change Language
A nucleus of uranium decays at rest into nuclei of thorium and helium. Then
A
The helium nucleus has more momentum than the thorium nucleus.
B
The helium nucleus has less kinetic energy than the thorium nucleus.
C
The helium nucleus has more kinetic energy than the thorium nucleus.
D
The helium nucleus has less momentum than the thorium nucleus.
4
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
Change Language
A photoelectric surface is illuminated successively by monochromatic light of wavelength $$\lambda $$ and $$\lambda/2 $$. If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times that in the first case, the work function of the surface of the material is
(h = Planck's constant, C = speed of light)
A
$${{2hc} \over \lambda }$$
B
$${{hc} \over {3\lambda }}$$
C
$${{hc} \over {2\lambda }}$$
D
$${{hc} \over \lambda }$$