1
JEE Main 2017 (Online) 8th April Morning Slot
+4
-1
The maximum velocity of the photoelectrons emitted from the surface is v when light of frequency n falls on a metal surface. If the incident frequency is increased to 3n, the maximum velocity of the ejected photoelectrons will be :
A
less than $$\sqrt 3$$ v
B
v
C
more than $$\sqrt 3 \,v$$
D
equal to $$\sqrt 3 \,v$$
2
JEE Main 2017 (Offline)
+4
-1
An electron beam is accelerated by a potential difference V to hit a metallic target to produce X–rays. It produces continuous as well as characteristic X-rays. If $$\lambda$$min is the smallest possible wavelength of X-ray in the spectrum, the variation of log$$\lambda$$min with log V is correctly represented in:
A
B
C
D
3
JEE Main 2017 (Offline)
+4
-1
A particle A of mass m and initial velocity v collides with a particle B of mass m/2 which is at rest. The collision is head on, and elastic. The ratio of the de-Broglie wavelengths $${\lambda _A}$$ to $${\lambda _B}$$ after the collision is:
A
$${{{\lambda _A}} \over {{\lambda _B}}} = {1 \over 3}$$
B
$${{{\lambda _A}} \over {{\lambda _B}}} = 2$$
C
$${{{\lambda _A}} \over {{\lambda _B}}} = {2 \over 3}$$
D
$${{{\lambda _A}} \over {{\lambda _B}}} = {1 \over 2}$$
4
JEE Main 2016 (Online) 10th April Morning Slot
+4
-1
A photoelectric surface is illuminated successively by monochromatic light of wavelengths $$\lambda$$ and $${\lambda \over 2}.$$ 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 is :
A
$${{hc} \over {3\lambda }}$$
B
$${{hc} \over {2\lambda }}$$
C
$${{hc} \over {\lambda }}$$
D
$${3\,{hc} \over {\lambda }}$$
JEE Main Subjects
Physics
Mechanics
Electricity
Optics
Modern Physics
Chemistry
Physical Chemistry
Inorganic Chemistry
Organic Chemistry
Mathematics
Algebra
Trigonometry
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Calculus
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