1
JEE Main 2017 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
A diverging lens with magnitude of focal length 25 cm is placed at a distance of 15cm from a converging lens of magnitude of focal length 20cm. A beam of parallel light falls on the diverging lens. The final image formed is:
A
real and at a distance of 6 cm from the convergent lens.
B
real and at a distance of 40 cm from convergent lens.
C
virtual and at a distance of 40 cm from convergent lens.
D
real and at a distance of 40 cm from the divergent lens.
2
JEE Main 2017 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
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
JEE Main 2017 (Offline) Physics - Dual Nature of Radiation Question 139 English Option 1
B
JEE Main 2017 (Offline) Physics - Dual Nature of Radiation Question 139 English Option 2
C
JEE Main 2017 (Offline) Physics - Dual Nature of Radiation Question 139 English Option 3
D
JEE Main 2017 (Offline) Physics - Dual Nature of Radiation Question 139 English Option 4
3
JEE Main 2017 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
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 2017 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
Some energy levels of a molecule are shown in the figure. The ratio of the wavelengths r = $${{\lambda _1}}$$/$${{\lambda _2}}$$, is given by:

JEE Main 2017 (Offline) Physics - Atoms and Nuclei Question 185 English
A
r = 1/3
B
r = 4/3
C
r = 2/3
D
r = 3/4
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