MCQ
The material suitable for making a solar cell is
- A$PbS$
- ✓$GaAs$
- C$CdSe$
- D$Ge$
Ga As has a band gap close to $1.5 \,eV$ which in same as maximum intensity of solar radiation spectrum.
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Statement $-2$ : To conserve energy and momentum in $\beta$ decay at least three particles must take part in the transformation.
Statement $1$: A charged particle is moving at right angle to a static magnetic field . During the motion the kinetic energy of the charge remains unchanged.
Statement $2$: Static magnetic field exert force on a moving charge in the direction perpendicular to the magnetic field.
