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Which value is closest to the wavelength in nanometer of a quantum of light with frequency of 6 × 1015 s-1? Option A 75 Option B 10 Option C 25 Option D 50 Solution: Correct Option D Given: Plank’s...
emitting waves of frequency 
and an observer 
are located at some distance from each other. The source is moving with a speed of 
at an angle of 
with the source observer line as shown in the figure. The observer is at rest. The apparent frequency observed by the observer (velocity of sound in air 
), is: (1) 
(2) (3) 
(4) 
The correct solution is (3) $ \begin{array}{l} t^{1}=f_{0}\left(\frac{v-v}{v-v_{s}}\right) \\ f^{1}=100\left(\frac{v-0}{v-(+9.7)}\right) \\ f^{1}=100 \frac{v}{v\left(1-\frac{9.7}{V}\right)}...
and 
are functions of times, then the value of 
at which they are orthogonal to each other is:(1) 
(2) 
(3) 
(4) 
The correct Solution is (4) $ \begin{array}{l} \bar{A}=\cos w t \hat{i}+\sin w t \hat{\jmath} \\ \bar{B}=\cos \frac{w t}{2} \hat{i}+\sin \frac{w t}{2} \hat{} \end{array} $ for $\vec{A} \cdot...
and maximum velocity is 
. Then, its time period of vibration will be: (1) 
(2) 
(3) 
(4) 
The correct Solution is (1) $ \begin{array}{l} \omega^{2} A=\alpha \\ \omega A=\beta \\ \Rightarrow \omega=\frac{\alpha}{\beta} \\ \Rightarrow T=\frac{2 \pi}{\omega}=\frac{2 \pi \beta}{\alpha}...
The correct option is 3 $\mathrm{Y}=\frac{\mathrm{W}}{\mathrm{A}} \cdot \frac{\ell}{\Delta \ell} $ So $\Delta \ell=\frac{W \ell}{A Y}$ $ \begin{array}{c} \Delta \mathrm{e}_{1}=\Delta \mathrm{e}_{2}...
fine holes, each of radius 
. If the speed of the liquid in the tube is 
, the speed of the ejection of the liquid through the holes is : (1) 
(2) 
(3) 
(4) 
The solution is option 3 Volume inflow rate = volume anflow rate $ \pi R^{2} V=n \pi r^{2} \quad \Rightarrow \quad v=\frac{\pi R^{2} V}{n \pi r^{2}}=\frac{V R^{2}}{\mathrm{nr}^{2}} $
The correct solution is 4 The induced current will be anticlockwise as $ e^-$ approaches. The induced current will be clockwise as $e^-$ moves further away.
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