CBSE > Class 12 > Physics | CBSE Board | Homework Help

Because Light Wavelength is actually less than a sound wave. And Diffraction is more in longer wavelength waves, as is less in wider slits. The wavelength of sound is of the order of 1meter. ...Diffraction of light an be best observed when a small slit is used.

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Define a wavefront

Posted by Thakur Anubhav Singh 5 years ago

CBSE > Class 12 > Physics

2 answers

Mr. Singh 5 years ago

Wavefront is defined as the imaginary surface constructed by the locus of all points of a wave that have the same phase, i.e. have the identical path length from the source of the wave..... For parallel rays, the waterfront is a plane surface, whereas for diverging or converging rays, the wave front is spherical.

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Pooja Singh 5 years ago

Wave front is the locus of all the points of a medium which are vibrating in the same place. I hope it helps you!!

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Optical instruments - the eye, the microscope,telescope are deleted or not???

Posted by S P 5 years ago

CBSE > Class 12 > Physics

2 answers

Drishty Kamboj 5 years ago

What ......?....in my preboard i was asked about the angular magnification of a compound microscope

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Manya Negi 5 years ago

They are deleted

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Why electromagnetic waves are transverse in nature????

Posted by Tanya ?? 5 years ago

CBSE > Class 12 > Physics

2 answers

Mr. Singh 5 years ago

In an electromagnetic waves, electric and magnetic field vector are perpendicular to each other and at the same time are perpendicular to the direction of propagation of the wave. You can create a transverse wave by moving your hands in different different direction.

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Shravan Kumar 5 years ago

In an electromagnetic wave, electric and magnetic field vectors are perpendicular to each other and at the same time are perpendicular to the direction of propagation of the wave. This nature of electromagnetic wave is known as Transverse nature.

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Semiconductor, atoms and nuclei wale chapters m.kon kon se topic krne h ??? Please jldi batana kl.mera examm h...

Posted by Tanya ?? 5 years ago

CBSE > Class 12 > Physics

5 answers

Tanya ?? 5 years ago

Ok thank u

3Thank You

Mr. Singh 5 years ago

Ye topic reduce hua hai Ok

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Mr. Singh 5 years ago

ATOM ;; alpha-particle scattering experiment,, Rutherford model of atom,, Bohr model,, energy level,, hydrogen spectrum... (NULLEI;;)> Mass-energy relation,, mass defect,, nuclear fission,, Nuclear fusion,.. (SEMICONDUCTOR;;)> Energy bond in conductor,, semiconductor and insulators (qualitative ideas only),, semiconductor diode -I-V- characteristics in forward and reserve bias,, diod as a rectifier,, special purpose p-n junction diodes,, LED,, photodiode,, solar cells..

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Tanya ?? 5 years ago

Arey yaar!!! Vo Maine kr lia check....par mujhe ye smj ni aa rha konse konse topic krne h ???

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Aditya Choudhery 5 years ago

Check reduced course

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Any four differences between refracting telescope and reflecting telescope.

Posted by Jass . 4 years, 8 months ago

CBSE > Class 12 > Physics

1 answers

Sia ? 4 years, 8 months ago

A Reflecting telescope has either a single or a combination of curved mirrors that is used to reflect the light rays and form an image. On the other hand, a refracting telescope has a lens as its objective lens to form an image.
Reflecting telescopes use mirrors whereas the refracting telescopes use lenses.
Reflecting telescopes have less chromatic aberrations whereas the refracting telescopes have chromatic aberrations.
Reflecting telescopes have disappointing optical quality whereas refracting telescopes have excellent contrast and sharpness.

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What is the focal length of plane lens?

Posted by Jass . 5 years ago

CBSE > Class 12 > Physics

1 answers

Mr. Singh 5 years ago

To focus an object 1m away (s1=1000mm),the lens must be moved 2.6mm farther away from the image plane, to s2=52.6mm. The focal length of a lens determines the magnification at which it image distant objects.

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Explain modulation

Posted by Ashish Kumar 5 years ago

CBSE > Class 12 > Physics

1 answers

Insha Khalid 5 years ago

It is a process of supremposing low audio frequency on a high frequency.

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Derive the magnetic field at the centre of semicircular current carrying conductor.

Posted by Sidra Naushad 5 years ago

CBSE > Class 12 > Physics

0 answers

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What is lc combination???

Posted by Tanya ?? 5 years ago

CBSE > Class 12 > Physics

1 answers

Mr. Singh 5 years ago

An lc circuit, also called a resonant circuit, tank circuit or tuned circuit is an electric circuit consisting of an inductor, represented by the letter L, and a capacitor, represented by the letter C, connected together.

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Why we not used sign convention in telescope

Posted by Abhishek Vishvakarma 5 years ago

CBSE > Class 12 > Physics

0 answers

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What is plank constant

Posted by Sidra Naushad 5 years ago

CBSE > Class 12 > Physics

2 answers

Sidra Naushad 5 years ago

Ok thnks

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Mohammad Areeb 5 years ago

It is a constant given by plank and is denoted by k. Value of k is 6.67x 10–³⁴

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What is the difference between diffraction of light and sound waves?

Posted by Jass . 5 years ago

CBSE > Class 12 > Physics

1 answers

Abhishek Vishvakarma 5 years ago

Are yaar

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Self inductance define???

Posted by Nitin Kumar Saini 5 years ago

CBSE > Class 12 > Physics

1 answers

Shravan Kumar 5 years ago

Self-inductance: Self inductance is defined as the phenomenon in which a change in electric current in a circuit produces an induced electro-motive-force in the same circuit.

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What are the reasons why one is not getting image tip to tip of object needle over image needle

Posted by Drishty Kamboj 5 years ago

CBSE > Class 12 > Physics

2 answers

Drishty Kamboj 5 years ago

Bro ye practical hai physics ka ....to find focal length of a convex lens ...

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Yogesh Chauhan 5 years ago

Yeh sab khase padh rhi mere toh kch smjh nhi aa rha...

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Two metallic spheres a and b kept on insulating stands are in contact with each other a positively charged on p is brought near the sphere a as shown in the figure . The two spheres is removed what will be the nature of charges on spheres. A and B

Posted by Joban Chahal 5 years ago

CBSE > Class 12 > Physics

2 answers

Parkie Rani 5 years ago

This is the method by induction The sphere A becomes negatively charged and sphere B becomes positively charged.

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Sachchidanand Vishwakarma 5 years ago

Where is figure

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Magnetic field vs electric field

Posted by A.P Singh 5 years ago

CBSE > Class 12 > Physics

1 answers

Shweta? Dhama? 5 years ago

An electric field essentially a force field that's created around an electrically charged particle...during this +ve charge is drawn and -ve chrged is repelled. A magnetic field is one that's created around a permanent magnetic substance or a moving electrically charged object......hope soo it helps u

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De brogli's law

Posted by Asha Prajapati 5 years ago

CBSE > Class 12 > Physics

1 answers

Kapil Adhikari 5 years ago

Lllll

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Two bodies move uniformly. You start the movement at the zero point. Body 1 has the structure speed v1 = 5 m / s and body 2 has the speed v2 = 10 m / s. a) Give the formulas for v (t) and s (t)! b) Draw the s-t diagram and the v-t diagram of these movements! c) What distance do the two bodies cover in 10 seconds?

Posted by Mehdi Ali 5 years ago

CBSE > Class 12 > Physics

0 answers

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Planks constant

Posted by Arshi Afzal 5 years ago

CBSE > Class 12 > Physics

1 answers

Abhijeet Shete 5 years ago

6.626×10−34 joule-sec

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Explain the construction and working of a moving coil galvanometer..

Posted by Unstable Zeya 4 years, 8 months ago

CBSE > Class 12 > Physics

1 answers

Sia ? 4 years, 8 months ago

PRINCIPLE
When a current carrying coil is placed in a uniform magnetic field, it experiences a torque.

CONSTRUCTION
It consists of a rectangular coil of an insulated copper wire wound a non conducting frame. The coil is suspended between the concave shaped poles of a permanent horse-shoe magnet by a phosphor-bronze wire. The upper end of this wire is connected to torsional head. The lower end of the coil is connected to phosphor-bronze spring. A small concave mirror M is attached to measure the deflection of the coil.
The Young's modules of phosphor bronze is high but rigidity modules is low. S, it can be twisted very easily but cannot be elongated.
A soft iron cylinder is arranged inside the rectangular frame of the coil. This cylinder increases the field intensity in between the poles. The combination of curved poles and the soft iron produces a radical magnetic field. In radical field, the plane of the coil will be always parallel to the field and experiences a maximum and constant torque. The whole arrangement is kept inside a brass case provided with a glass window. The deflection of the coil can be measured using lamp and scale arrangement.

WORKING
When the current to be measured is passed through the coil, experiences a deflecting torque. Then the coil begins to turn. As the coil turns the phosphor-bronze wire gets twisted. As a result, an oppositely directed restoring couple develops in the phosphor-wire.
Let us consider n be the number of turns of the coil, A be the area of the coil B be the intensity of magnetic induction field, and i be the current through the coil.
Now, As the field is radical, the plane of the coil is always parallel to the magnetic filed. Then the coil experiences a constant and maximum deflecting torque.
τd = niAB
If C is the restoring copper per unit twist and θ is the deflection of the coil, then restoring torque.
τr = Cθ
In equilibrium position, the deflecting torque is equal to the restoring torque.
τd = τr
niAB = Cθ
(OR) i = C/nABθ
(OR) i = Kθ where K = C/nAB is a constant for the galvanometer.
So, i ∝ θ
Thus, the current flowing through the moving coil galvanometer is directly proportional to the deflection of the coil. It means the moving coil galvanometer has a linear scale. It is an important advantage because the instrument can be accurately calibrated.

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Electric field due to non-conducting solid sphere

Posted by Nikita Saran 5 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Tejasvini S 5 years, 1 month ago

Outside the sphere : In this case taking O as centre and r as radius, a spherical Gaussian surface is drawn. ... Point P will be situated at this surface. Now the charge enclosed by this Gaussian surface, From the definition of the electric flux.

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A point charge q1=+6e is fixed at the origin of a coordinate system ,and another point charge q2 =-10e is fixed at x =10nm, y=0. The locus of all points in xy plane for which potential v=0 is a circle centered on the x axis . Now what is the radius of the circle , what is the x coordinate center of the circle is , what is the potential at the center of the circle is

Posted by Shikha Singh Singh 5 years, 1 month ago

CBSE > Class 12 > Physics