In a double slit interference experiment, the separation between … - Vidyadip

Question

In a double slit interference experiment, the separation between the slits is 1.0mm, the wavelength of light used is $5.0 × 10^{-7}m$ and the distance of the screen from the slits is 1.0m.

Find the distance of the centre of the first minimum from the centre of the central maximum.
How many bright fringes are formed in one centimeter width on the screen?

✓

Answer

Given that, $d = 1mm = 10^{-3}m, D = 1m.$
So, fringe with $=\frac{\text{D}\lambda}{\text{d}}=0.5\text{mm}.$

So, distance of centre of first minimum from centre of central maximum $=\frac{0.5}{2}\text{mm}=0.25\text{mm}$
No. of fringes $\frac{10}{0.5}=20.$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "2 Marks Questions" from Wave Optics→Wave Optics — all question types→Physics STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

What is being done to change the range of voltmeter?

On a cold winter night you are asked to sit on a chair. Would you like to choose a metal chair or a wooden chair? Both are kept in the same lawn and are at the same temperature.

Explain from where does the dissipated power in the resistor come form.
###
Write a short note on electric cell.

A voltage of 30 V is applied across a carbon resistor with first, second and third rings of blue, black and yellow colours respectively. Calculate the value of current, in mA, through the resistor.

A block of mass m containing a net positive charge q is placed on a smooth horizontal table which terminates in a vertical wall as shown in figure. The distance of the block from the wall is d. A horizontal electric field E towards right is switched on. Assuming elastic collisions (if any) find the time period of the resulting oscillatory motion. Is it a simple harmonic motion?

Derive the formula for electrostatic potential due to a point charge.

Explain the process of thermonuclear fusion as a source of energy in the Sun.

Describe, with the help of a circuit diagram, the working of a photodiode.

An object is placed at the principal focus of a concave lens of focal length f. Where will its image be formed?
$\frac{1}{\text{f}}=\frac{1}{\text{v}}-\frac{1}{\text{u}}$
$\Rightarrow\frac{1}{\text{v}}=\frac{1}{\text{f}}+\frac{1}{\text{u}}$

Find the thermo-emf developed in a copper-silver thermocouple when the junctions are kept at $0^\circ$C and $40^\circ$C. Use the data in table.

Metal with	a	b
lead (Pb)	$\mu\text{V}/^\circ\text{C}$	$\mu\text{V}/^\circ(\text{C})^2$

Aluminium	-0.47	0.003
Bismuth	-43.7	-0·47
Copper	2.76	0·012
Gold	2.90	0.0093
Iron	16.6	-0.030
Nickel	19.1	-0.030
Platinum	-1.79	-0.035
Silver	2.50	0.012
Steel	10.8	-0.016