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Give any two uses of infrared rays

Posted by Mohammed Sameer 7 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Gaurav Seth 7 years, 1 month ago

Two uses of infrared rays:

In knowing the molecular structure.
In remote control of TV,VCR etc.

Abhishek Kumar Patel 7 years, 1 month ago

1- Heat sensitive thermal imaging cameras 2-for night vision camera

ANSWER

Show that the potential of a charged spherical conductor kept at the centre of a charged hollow spherical conductor is always greater than that of the hollow spherical conductor irrespective of the charge accumulated on it.

Posted by Nitesh Kumar 7 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Proton move with a speed of 7.45 x 10 ^5 m /s directly towards a free Proton initially at rest find the distance of the closest approach for the two protons

Posted by Nitesh Kumar 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Sangitaben Patel 7 years, 1 month ago

Apply energy conservation... KE=PE 1/2 x mass of proton x velocity^2. =. (ke^2)/r Where r = distance of closest approach

ANSWER

The spherical shell of Van De graaff generator is to be charged to a potential of 2 million volt calculate the minimum radius the cell can have if the dielectric strength of air is 0.8 kV per mm.

Posted by Nitesh Kumar 7 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

????? ???? 7 years, 1 month ago

That it is not in syllabus..... see ncert book of physics

Sakshi Singh 7 years, 1 month ago

Van de graff generator isn't in the syllabus.

ANSWER

Two identical metal plates are given positive charge Q1 and Q2 where Q1 is greater than Q2 find the potential difference between them if they are now brought together to form a parallel plate capacitor with capacitance C?

Posted by Nitesh Kumar 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Sourabh Sheokand 7 years, 1 month ago

Q1 - Q2 /C

ANSWER

An electron is placed at A in the presence of a point charge + q located at C is moved to a point B such that ABC is an equilateral triangle. find the work done in the process?

Posted by Nitesh Kumar 7 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Show that at a point where the electric field intensity is zero electric potential need not be zero

Posted by Nitesh Kumar 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Mohammed Sameer 7 years, 1 month ago

Inside the charged shell I think so

ANSWER

Why in millikan's Oil Drop experiment the charge measured was always found to be of some discrete value and not any arbitrary value

Posted by Nitesh Kumar 7 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

How does the electric flux and electric field enclosing a given charge vary when the area enclosed by the charge is doubled?

Posted by Nitesh Kumar 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Sourabh Sheokand 7 years, 1 month ago

Electric Flux is constant and electric field is half

ANSWER

Two electric charges - 4uC and 3uC placed at the two corners B and C respectively of an isosceles right angled triangle ABC right angled at B of side 1m. What is the direction and magnitude of electric field at A due to two charges?

Posted by Nitesh Kumar 7 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What is electri potential at an axial point of a dipole ?

Posted by Ak Rock Creation 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Nitesh Kumar 7 years, 1 month ago

Kp/r^2 - a^2, where K=9 × 10^9

ANSWER

Series combination od metre bridge observation table

Posted by Nishant Kumar 7 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Give relation between work function and wavelength.

Posted by Ahmad Reza 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Tannu Rani 7 years, 1 month ago

Work function = hc÷threshold wavelength

ANSWER

Define term cinductivity of a metallic wire and write its si unit

Posted by Aniket Mishra 7 years, 1 month ago

CBSE > Class 12 > Physics

3 answers

Meenakshi Sangwan 7 years, 1 month ago

Reciprocal of the resistivity of mettalic wire.SI unit is (s/m) semen per meter

Meenakshi Sangwan 7 years, 1 month ago

You have to answer it ....not to find out mistakes

Aakash Panchal 7 years, 1 month ago

Plz write correct spelling

ANSWER

What's the weightage of chp. Of phy for boards

Posted by Rahul Choudhary 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Tannu Rani 7 years, 1 month ago

Check it on google

ANSWER

What is the weightage of all the in boards

Posted by Rahul Choudhary 7 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Which book contains good questions to do before exams

Posted by Stuti Bhatt 7 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Sakshi Singh 7 years, 1 month ago

If you rgoing for questions, then it's mtg's "Champion" and if notes and other questions then mtg's "Excel"

Harish Dewangan 7 years, 1 month ago

Arihant chapterwise

ANSWER

Which sample paper books are good for preparation of physics

Posted by Stuti Bhatt 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Mike Western 7 years, 1 month ago

EAD

ANSWER

Sin 24 degree 44' how to solve this que

Posted by Sourabh Singh 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Raunak Himmatramka 7 years, 1 month ago

You can only find its near value for exact value use calculater

ANSWER

To determine the focal length of concave mirror

Posted by Alok Kumar 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Raunak Himmatramka 7 years, 1 month ago

Use mirror formula

ANSWER

The current of electric bulb is increased by 1%.what is the effect on its power

Posted by Vidyadhar Singh 7 years, 1 month ago

CBSE > Class 12 > Physics

3 answers

Raunak Himmatramka 7 years, 1 month ago

It is in chapter error

Tannu Rani 7 years, 1 month ago

Give theory relevant to it and à detailed answer plzzzz raunak

Raunak Himmatramka 7 years, 1 month ago

It is increased by 2% if the resistance is constant

ANSWER

How to get blueprint of PCB

Posted by Ashwini Kumar Mohanty 7 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Is cbse directly ask questions from the physic book ncert class 12

Posted by Ranjan Kumar 7 years, 1 month ago

CBSE > Class 12 > Physics

3 answers

Raunak Himmatramka 7 years, 1 month ago

U understood what i m saying then it doesnot matter how But thanks for correcting me

Sakshi Singh 7 years, 1 month ago

Raunak Himmatramka, your English is poor. We can't use will with conditional sentences, I mean with "if".??????????

Raunak Himmatramka 7 years, 1 month ago

No. If it will happen then the score will be very law

ANSWER

Pn junction diode is highly sensitive.comment

Posted by Kuldeep Chaudhary 5 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Shubhankar Kumar 7 years, 1 month ago

*P-N junction diode in reverse biased configuration is sensitive to light from a range between 400nm to 1000nm, which includes VISIBLE light. Therefore, it can be used as a photodiode. ... The voltage across the P-N junction biased is used to create Temperature Sensors, and Reference voltages.* (in simple - photodiode is a special p-n junction made for photosensitive semiconductor material whose function is controlled by light allowed to fall on it)

ANSWER

What is electric charge.

Posted by Manish Singh Bhakuni 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Akshat Mishra 7 years, 1 month ago

Electric charge is the physical property of matter that causes it to experience a force when placed in an electromagnetic field. Si unit - coulomb (c) Si base unit - c=As Other unit - faraday

ANSWER

Which physical quantity does the slope of voltage vs current graph for a metallic conductor depict? Give its S.I unit.

Posted by Jyotishmita Kurmi 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Nivedita Vishwakarma 7 years, 1 month ago

Resistance si unit - ohm

ANSWER

Derivation of displacement current

Posted by Zishan Khan 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Manisha G 5 years, 10 months ago

derivation please

ANSWER

Si unit if electric polarisatiin p

Posted by Harsh Singh 7 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Suraj Lata Chaudhary 7 years, 1 month ago

C/m`²

Zishan Khan 7 years, 1 month ago

C/m^2

ANSWER

Main derivations

Posted by Aryan Sagar 7 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Welders wear special glass googles while working. Why?

Posted by Gauri Khandelwal 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 7 years, 1 month ago

Welders wear special goggles or face masks with glass windows to protect their eyes from Ultra Violet Rays (UV-rays).
Frequency range of UV- rays is 7.5 ×10¹⁴ to 5×10¹⁷ Hz (800 THz to 30 PHz).

ANSWER

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