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

According to wave theory :
(i) The maximum kinetic energy of the emitted electron should be directly proportional to the intensity of incident radiations, but it is not observed experimentally. Also the maximum kinetic energy of the emitted electrons should not depend upon incident frequency according to wave theory, but it is not so.
(ii) Electron emission should take place at all frequencies of radiations, i.e. there should not exist the threshold frequency. This fact contradicts experimental observation.
(iii) There should be a time lag in photo electric emission but according to observation photo electric emission is instantaneous.

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What do u mean by l C R

Posted by Sudhakar Mishra 5 years, 11 months ago

CBSE > Class 12 > Physics

2 answers

Aditya Kumar Mishra 7 years, 3 months ago

LCR is circuit containing inductor capacitor resistor connted in series

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Bharat Kumar 7 years, 3 months ago

LCR means a circuit in which L-inducter,C-capacitor and R-resistor are present.

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A 10 v cell of geligible internel resistance in connected in parallel a battery of emf 200 v internel resistance 38ohm as shown in figure. Find tha value of current in tha circuit

Posted by Poonam Saket 7 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Mahipal Choudhary 7 years, 3 months ago

Where is the diagram

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A small sphere of radius R1 and charge Q1 is enclosed by a spherical shell of radius R2 and charge Q 2 to show that if one is positive charge will necessarily flow from the sphere to the the the cell when the two are connected by wire no matter what the charge Q2 on the cell is

Posted by Nikhil Kumar 7 years, 3 months ago

CBSE > Class 12 > Physics

0 answers

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Potential difference across a conductor means what, explain it

Posted by Mahendra Varman 7 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Devashish Singh 7 years, 3 months ago

Suppose a rod of length L and area of cross section a is taken one battery is connected to the rod such that one terminal the rod is heated the electrons will vibrate and will move to the other end of other rod such that when a a difference is developed between two terminals of the rod then the current start flowing . hence when potential difference develops then the current flows. According to ohm's law V is directly proportional to I

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Relation between weber and Telsa

Posted by Bandana Pati 7 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Devashish Singh 7 years, 3 months ago

It is commonly denoted by the symbol B. In SI units, the magnetic flux density is measured in teslas (T) and correspondingly magnetic flux is measured in weber (Wb) so that a flux density of one Wb/m² is one tesla. In Gaussian-CGS units, magnetic flux density is measured in gauss (G).

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What is snells law

Posted by Diljani . 7 years, 3 months ago

CBSE > Class 12 > Physics

3 answers

Neha Verma 7 years, 3 months ago

The ratio of sin of angle of incident and sin of angle of refraction is always equal to speed of light in medium one with respect to speed of light in medium two is called Snell'Law. Note :-Number of refraction =number of Snell's law.

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Priyanka Malik 7 years, 3 months ago

Refractive index = Sin i/sin r

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Kaustubh Soni 7 years, 3 months ago

Sini/Sinr always remains constant for a given pair of media

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Two charges e and 5e what will be the dipole?

Posted by Ishaan Kohli 7 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

H T 7 years, 3 months ago

Dipole is due to two oppositely charges of equal magnitude so ans is zero b/c it not opp and equal in magnitude

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What is gauss theorum

Posted by Neeraj Kathayat 7 years, 3 months ago

CBSE > Class 12 > Physics

0 answers

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What to do for chemistry i am in class 12th preparing 4 2018-19 board xams???

Posted by Suryansh Jain 7 years, 3 months ago

CBSE > Class 12 > Physics

5 answers

Omparkash Yadav 7 years, 3 months ago

Focus on study and forget enjoy

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Shreya Bhardwaaj 7 years, 3 months ago

Starting se concept clear krte jao aur question solve krte jao topic se related

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Suryansh Jain 7 years, 3 months ago

Any more suggestion

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Neeraj Kathayat 7 years, 3 months ago

Do smart study bro......

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Anjali Shaktawat 5 years, 11 months ago

Silently learn kar chup chap

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https://youtu.be/UJGB5AYQgGk like and suscribe

Posted by Anita Yadav 7 years, 3 months ago

CBSE > Class 12 > Physics

0 answers

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Derive an expression for the force between long straight conductor carrying current derivation

Posted by Rohit Kumar 7 years, 3 months ago

CBSE > Class 12 > Physics

2 answers

Priyanka Malik 7 years, 3 months ago

Oh sorry...by mistake post ho gya.......uper wale question ks post kr rhi thi ?

1Thank You

Priyanka Malik 7 years, 3 months ago

Ya I hv prepared.......which type of do u want

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How to solve ncert exercise Can't able to clear all the questions....

Posted by Shivam Sharma 7 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Shubhangi Singh 7 years, 3 months ago

First clear your concept n then revise it n then go for the chapter questions

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If Q =(t²+4t+7)c. find initial current and current at t is equal to 2

Posted by Varsha Singh 7 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Neeraj Kathayat 7 years, 3 months ago

I don't know..hihihi

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Guys my syllabus has been completed in all subjects and my pre boards are from 4 dec So I am very confused from where did i start Can anyone help me out.

Posted by Abhay Singh Tomar 7 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Shreya Bhardwaaj 7 years, 3 months ago

From starting clear all the concepts and start attempting questions of it

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Why have to study phy

Posted by Aryan Pandit 7 years, 3 months ago

CBSE > Class 12 > Physics

2 answers

Raunak _ Pandey ?? 7 years, 3 months ago

Albert Einstein ki respect karne ke liye

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Aarav Raj 7 years, 3 months ago

To know our nature and natural phenomeno

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Fleming's rule in magnetism

Posted by Harsh Jain 7 years, 3 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

a blue light is incident on photosensitive surface does the electron emit by the surface or not

Posted by Shivam Rana 7 years, 3 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What are the reasons yo believe that light is a wave motion

Posted by Rupinder Aulakh 5 years, 11 months ago

CBSE > Class 12 > Physics

1 answers

Aarav Raj 7 years, 3 months ago

Wave characteristics .ac to De broglie .

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How can we show the wave nature of a particle and by which experiment ?

Posted by Mukul Sharma 7 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Aarav Raj 7 years, 3 months ago

Davisson and Germer

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What is induced current?

Posted by Diljani . 7 years, 3 months ago

CBSE > Class 12 > Physics

2 answers

Sameeksha Meena 7 years, 3 months ago

When a current flows through a wire or a coil a magnetic field will be created. When we move a conducting material in that magnetic field will be created in the conducting material. This current is known as induced current.

5Thank You

Diljani . 7 years, 3 months ago

Answer it guys..

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