1
JEE Advanced 2019 Paper 2 Offline
MCQ (More than One Correct Answer)
+4
-1
Change Language
In a Young's double slit experiment, the slit separation d is 0.3 mm and the screen distance D is 1 m. A parallel beam of light of wavelength 600 nm is incident on the slits at angle $$\alpha $$ as shown in figure.

JEE Advanced 2019 Paper 2 Offline Physics - Wave Optics Question 16 English

On the screen, the point O is equidistant from the slits and distance PO is 11.0 mm. Which of the following statement(s) is/are correct?
A
For $$\alpha $$ = 0, there will be constructive interference at point P.
B
For $$\alpha = {{0.36} \over \pi }$$ degree, there will be destructive interference at point P.
C
For $$\alpha $$ = $$\alpha = {{0.36} \over \pi }$$ degree, there will be destructive interference at point O.
D
Fringe spacing depends on $$\alpha $$.
2
JEE Advanced 2019 Paper 2 Offline
MCQ (More than One Correct Answer)
+4
-1
Change Language
A free hydrogen atom after absorbing a photon of wavelength $$\lambda $$a gets excited from the state n = 1 to the state n = 4. Immediately after that the electron jumps to n = m state by emitting a photon of wavelength $$\lambda $$e. Let the change in momentum of atom due to the absorption and the emission be $$\Delta {p_a}$$ and $$\Delta {p_e}$$, respectively. If $${{{\lambda _a}} \over {{\lambda _e}}} = {1 \over 5}$$, which of the option(s) is/are correct? [Use hc = 1242 eVnm; 1 nm = 10-9 m, h and c are Planck's constant and speed of light in vacuum, respectively]
A
The ratio of kinetic energy of the electron in the state n = m to the state, n = 1 is $${1 \over 4}$$
B
m = 2
C
$${{\Delta {p_a}} \over {\Delta {p_e}}} = {1 \over 2}$$
D
$$\lambda $$e = 418 nm
3
JEE Advanced 2019 Paper 2 Offline
MCQ (More than One Correct Answer)
+4
-1
Change Language
A mixture of ideal gas containing 5 moles of monatomic gas and 1 mole of rigid diatomic gas is initially at pressure P0, volume V0, and temperature T0. If the gas mixture is adiabatically compressed to a volume $${{{V_0}} \over 4}$$, then the correct statement(s) is/are

(Given, 21.2 = 2.3; 23.2 = 9.2; R is a gas constant)
A
The final pressure of the gas mixture after compression is in between 9P0 and 10P0
B
The average kinetic energy of the gas mixture after compression is in between 18RT0 and 19RT0
C
Adiabatic constant of the gas mixture is 1.6
D
The work |W| done during the process is 13RT0
4
JEE Advanced 2019 Paper 2 Offline
Numerical
+3
-0
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Suppose a $$_{88}^{226}Ra$$ nucleus at rest and in ground state undergoes $$\alpha $$-decay to a $$_{86}^{222}Rn$$ nucleus in its excited state. The kinetic energy of the emitted $$\alpha $$ particle is found to be 4.44 MeV. $$_{86}^{222}Rn$$ nucleus then goes to its ground state by $$\gamma $$-decay. The energy of the emitted $$\gamma $$ photon is ............ keV.

[Given : atomic mass of $$_{86}^{226}Ra$$ = 226.005 u, atomic of $$_{86}^{222}Rn$$ = 222.000 u, atomic mass of $$\alpha $$ particle = 4.000 u, 1 u = 931 MeV/e2, c is speed of the light]
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