Two deuterons are fused to form one alpha particle. If binding energy per nucleon of deuterium is 1.05 MeV and that of alpha particle is 7 MeV , what is the energy released in the formation of one alpha particle from the fusing of two deuterons?
24.8 MeV
23.8 MeV
26.8 MeV
28.3 MeV
If wattless current flows in an AC circuit, then the circuit is:
A. LR circuit
B. Purely capacitive circuit
C. Purely resistive circuit
D. LCR circuit
B
C
D
A

In the circuit given, the reverse breakdown voltage of the Zener diode is 4.8 V . The current through the Zener and the power dissipation in Zener is:
$22.4 \mathrm{~mA} ; 107.52 \mathrm{~mW}$
$2.88 \mathrm{~mA} ; 13.82 \mathrm{~mW}$
$28.8 \mathrm{~mA} ; 138.24 \mathrm{~mW}$
$12.4 \mathrm{~mA} ; 97.52 \mathrm{~mW}$
In a Young's double slit experiment, the slits are separated by 0.5 mm . Fringes are obtained on a screen which is placed at distance 1 m away from the slits. When the screen is moved 7 cm farther away, the fringe width changes by $63 \mu \mathrm{~m}$. The wavelength of light used in the experiment will be:
$4.5 \times 10^{-6} \mathrm{~m}$
$4.5 \times 10^{-7} \mathrm{~m}$
$0.5 \times 10^{-9} \mathrm{~m}$
$0.5 \times 10^{-7} \mathrm{~m}$
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