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What is interference of light? Two coherent waves, each of intensity I, are producing an interference pattern. What will be the resultant intensity at a point of:
i) Constructive interference
ii) Destructive interference
How do you explain the contraction of the solenoidal coil while the current is passed through it?
Why is it preferred over a resistor in ac circuit?
If the frequency of e.m.f. be increased, then what will be effect on the currents flowing in them? Explain.
What is choke coil?
In a sinusoidal sound wave of moderate loudness, the maximum pressure variations are of the order of above and below atmospheric pressure. Find the corresponding maximum displacement if the frequency is , in air at normal atmospheric pressure and density. The speed of sound is and the bulk modulus of the medium is .
A train is traveling at in still air. The frequency of the note emitted by the train whistle is . What frequency is heard by a passenger on the other train moving in the opposite direction to the first at , (i) when approaches the first and (ii) when receding from the first?
At what angle of incidence will the light reflected from water be completely polarized?
What causes earthquakes?
The flow of magma
The expansion of the earth’s crust
The rubbing together of earth’s plates
Tsunami
What will be the width of the ten fringes that he can measure in the first experiment?
Calculate the magnitude of the wavelength of the second Balmer series.
Find the expression for the wavelength of radiation emitted from a hydrogen atom when an electron jumps from higher energy level to the lower energy level .
Calculate the de-Broglie wavelength of an electron which has been accelerated through a potential difference of 300 V.
(Mass of electron = 9.1 × 10⁻³¹ kg, Planck's constant, h = 6.6 × 10⁻³⁴ Js)
Obtain an expression for the velocity of an electron in the first excited state.
A NOR gate ‘opens’ and gives an output only if both inputs are ‘low’, but an OR gate ‘closes’. An AND gate ‘opens’ only if both inputs are ‘high’, but a NAND gate ‘closes’. Construct a truth table for the circuit shown below including the states at $E$, $F$, and $G$.
Draw a circuit diagram of full wave rectifier.
A diode can be used as a rectifier. What characteristic of a diode is used in rectification?
What will be the expression for the charge of an oil drop if the electric force is greater than its weight?
Figure below shows the experimental setup of Millikan’s oil drop experiment. Find the expression for a charge of an oil drop of radius $r$ moving with constant velocity $v$ in a downward direction using a free body diagram.
Use the graph to calculate the value of the Planck constant in $\text{J s}$.