1
JEE Advanced 2016 Paper 2 Offline
MCQ (More than One Correct Answer)
+4
-2
Light of wavelength $$\lambda$$ph falls on a cathode plate inside a vacuum tube as shown in the figure. The work function of the cathode surface is $$\phi$$ and the anode is a wire mesh of conducting material kept at a distance d from the cathode. A potential difference V is maintained between the electrodes. If the minimum de-Broglie wavelength of the electrons passing through the anode is $$\lambda$$e, which of the following statement(s) is (are) true? A
$$\lambda$$e increases at the same rate as $$\lambda$$ph for $$\lambda$$ph < hc/$$\phi$$
B
$$\lambda$$e is approximately halved, if d is doubled
C
$$\lambda$$e decreases with increase in $$\phi$$ and $$\lambda$$ph
D
For large potential difference (V >> $$\phi$$/e), $$\lambda$$e is approximately halved if V is made four times
2
JEE Advanced 2015 Paper 1 Offline
MCQ (More than One Correct Answer)
+4
-2
For photo-electric effect with incident photon wavelength $$\lambda$$, the stopping potential is V0. Identify the correct variation(s) of V0 with $$\lambda$$ and $${1 \over \lambda }$$.
A B C D 3
JEE Advanced 2013 Paper 2 Offline
MCQ (More than One Correct Answer)
+3
-0.75
Using the expression $$2d\sin \theta = \lambda$$, one calculates the values of d by measuring the corresponding angles $$\theta$$ in the range 0 to 90o. The wavelength $$\lambda$$ is exactly known and the error in $$\theta$$ is constant for all values of $$\theta$$. As $$\theta$$ increases from 0o
A
the absolute error in d remains constant
B
the absolute error in d increases
C
the fractional error in d remains constant
D
the fractional error in d decreases
Physics
Mechanics
Electricity
Optics
Modern Physics
Chemistry
Physical Chemistry
Inorganic Chemistry
Organic Chemistry
Mathematics
Algebra
Trigonometry
Coordinate Geometry
Calculus
EXAM MAP
Joint Entrance Examination