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We observe that when a ray of white light falls on a prism it experiences refraction twice. Once when it travels from the rarer medium (air) to a denser medium (glass) and again from the denser medium (glass) to a rarer medium (air). Finally, we observe a band of colors, called spectrum, formed out of a ray of white light. If we observe this spectrum more closely, the color having a smaller wavelength deviates the most and vice versa. Thus, a spectrum of colors ranging from red to violet is observed where red having the longest wavelength suffers the least deviation. This kind of spectrum is called a continuous spectrum as violet merges into blue, blue into green and so on.

However, the emission spectrum of atoms in the gas phase, do not exhibit a continuous spread of wavelength from one color to other. Rather, the emitted light consists of a specific wavelength having dark spaces existing between them. Such kind of spectra is known as atomic spectra or line spectra.

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What is band spectrum?

Posted by ????? ???? 7 years ago

CBSE > Class 12 > Physics

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Yogita Ingle 7 years ago

Band spectra is the name given to groups of lines so closely spaced that each group appears to be a band, e.g., nitrogen spectrum. Band spectra, or molecular spectra, are produced by molecules radiating their rotational or vibrational energies, or both simultaneously.

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What is continuous spectrum?

Posted by ????? ???? 7 years ago

CBSE > Class 12 > Physics

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Four point charges Q,q,Q and q are placed at corner of cube of side a.find potential energy of the system

Posted by Irene Easow 7 years ago

CBSE > Class 12 > Physics

1 answers

Mohit Sepat 7 years ago

See in ncert answer

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I am not satisfied with anyone opinion for which is best book or sample paper . Everyone gives different opinions . I confiused . Please help me

Posted by Harshit Pratap Singh 7 years ago

CBSE > Class 12 > Physics

2 answers

Navya Singh 7 years ago

Arihant is best

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Mohit Sepat 7 years ago

Arihant is best book then Xamidea

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Sin ic =. 389. How to calculate value of ic in degree

Posted by Kiran Kumawat 7 years ago

CBSE > Class 12 > Physics

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how to convert ac to dc

Posted by Kunal Goyal 7 years ago

CBSE > Class 12 > Physics

1 answers

Navya Singh 7 years ago

Rectification. ..

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What is photoelectric effects,,

Posted by Shama Shama Sheikh 7 years ago

CBSE > Class 12 > Physics

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Twelve identical wires each of resistance 6 ohm are joined to form a skeletal cube.Find the resistance between the corners of the same edge of the cube.

Posted by Sanjna Choudhary 7 years ago

CBSE > Class 12 > Physics

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Ground state energy of hydrogen atom is -13.6eV what will be the. Potential energy of the electron in this state

Posted by Yashmeen Kaur 7 years ago

CBSE > Class 12 > Physics

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Very important question from emi and A.C.,?

Posted by Rajesh Chouhan 7 years ago

CBSE > Class 12 > Physics

1 answers

Gaurav Tibrewal 7 years ago

Root mean square value Lcr circuit and its resonance conditions

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Write the expression of electric field for thick conducting sheet

Posted by Gagan Robin Singh 7 years ago

CBSE > Class 12 > Physics

1 answers

Vishal Gupta 7 years ago

For thin sheet it is E=sigma/2eplson and for thick sheet it is E=sigma/eplson

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In a potentiometer arrangement for determining the emf of a cell, the balance point of the cell in open circuit is 350 cm. When a resistance of 9 is used in the external circuit of the cell, the balance point shifts to 300 cm. Determine the internal resistance of the cell.

Posted by Nikku Prajapat 7 years ago

CBSE > Class 12 > Physics

1 answers

Manan Bedi 7 years ago

Apply the formula r=R(l1/l2-1) 9(50/300) 9/6 =1.5 ohm

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A person peddal a stationary bicycle the peddal of bicycle are attached to 100 turns coil of area 0.1m^2 the coil rotate at half revolution per sec and placed in uniform magnetic field of 0.01tesla perpendicular to axis of rotation of coil what is the maximum voltage generated in the coil?

Posted by Nikku Prajapat 7 years ago

CBSE > Class 12 > Physics

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Define Coulomb's law?

Posted by Saurav Kumar 7 years ago

CBSE > Class 12 > Physics

2 answers

Amay Jain 7 years ago

The force of attraction of repulsion between any two charges is directly proportional to their product of charges and inversely to square of distance between them

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Manan Bedi 7 years ago

F=kq1q2/r^2

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Why is resonace condition is not possible in LC or LR ciruit?

Posted by Gautãm . 7 years ago

CBSE > Class 12 > Physics