Monochromatic light of wavelength $4800 \mathop {\rm{A}}\limits^{\rm{o}}$ falls on slit of width ' $a$ '. For what value of ' $a$ ', the first maximum falls at $30^{\circ} .\left(\sin 30^{\circ}=0.5\right)$
$14200 \mathop {\rm{A}}\limits^{\rm{o}}$
$14400 \mathop {\rm{A}}\limits^{\rm{o}}$
$14600 \mathop {\rm{A}}\limits^{\rm{o}}$
$15000 \mathop {\rm{A}}\limits^{\rm{o}}$
A bucket filled with water is revolved in a vertical circle of radius 10 m and water just not fall down. The time period of revolution will be (acceleration due to gravity $=10 \mathrm{~m} / \mathrm{s}^2$ )
$\pi \mathrm{s}$
$2 \pi \mathrm{~s}$
$10 \pi \mathrm{~s}$
$20 \pi \mathrm{~s}$
A charge of $8 \mu \mathrm{C}$ exists at the centre of the square $A B C D$. The work done in moving a $4 \mu C$ point charge from corner A to corner B is (Along side AB )
4 J
8 J
2 J
zero J
A stone is projected at an angle $60^{\circ}$ to the horizontal. The ratio of kinetic energy of the stone at point of projection to its kinetic energy at highest point of flight will be $\left(\cos 60^{\circ}=0.5\right)$
$1: 4$
$4: 1$
$\quad 2: 1$
$\sqrt{3}: 2$
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