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CBSE - XII Science - Physics - Electromagnetic Waves
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Asked by nitishkrnehu09
1st January 2018,
4:24 AM
CBSE - XII Science - Physics - Electromagnetic Waves
WHAT IS THE RATIO OF UV RAYS AND INFRARED RAYS IN GLASS?
PLEASE GIVE ANSWER EARLIER
Asked by modi72879
25th December 2017,
8:46 AM
CBSE - XII Science - Physics - Electromagnetic Waves
Arrange the following electromagnetic wave in the order of their increasing wavelength: (a) γ- rays (b) Microwaves (c) X-rays (d) Radio waves How are infra-red waves produced? What role dose infra-red radiation play in (i) maintain the Earth’s warmth and (ii) physical therapy?
Asked by Topperlearning User
10th July 2015,
8:24 AM
CBSE - XII Science - Physics - Electromagnetic Waves
What is/are the common factors between all kinds of electromagnetic radiations?
Asked by Topperlearning User
27th October 2014,
1:33 PM
CBSE - XII Science - Physics - Electromagnetic Waves
what is meant by transverse nature of electromagnetic waves?draw a diagram showing the propagation of an electromagnetic wave along the x direction ,indicating clearly the directions of the oscillaing electric and magnetic fields associated with it?
Asked by lolepradnya
27th September 2014,
7:33 PM
CBSE - XII Science - Physics - Electromagnetic Waves
Arrange the following electromagnetic radiations in ascending order of their frequencies: (i) Microwave (ii) Radio wave (iii) X-rays (iv) Gamma rays Write two uses of any one of these.
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Electromagnetic Waves
Name the part of the electromagnetic spectrum of wavelength 10-2m and mention its one application.
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Electromagnetic Waves
Electromagnetic spectrum is an orderly arrangement of electromagnetic radiations in the ascending or descending order of frequency/wavelength. (a) Arrange the following electromagnetic radiations in the ascending order of frequency. Visible rays, infrared rays, X-rays, microwaves. (b) Give one application of infrared and X-rays, each.
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Electromagnetic Waves
Which of the following, if any, can act as a source of electromagnetic waves. (i) A charge moving with a constant velocity (ii) A charge moving in a circular orbit. (iii) A charge at rest Give reason
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Electromagnetic Waves
Identify the part of the electromagnet spectrum which is i. Suitable for radar system used in aircraft navigation. ii. Adjacent to the low frequency of the electromagnetic spectrum iii. Produced in nuclear reactions. iv. Produced by bombarding a metal target by high speed electons.
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Electromagnetic Waves
Name the colours in the visible spectrum and their wavelengths in Armstrong.
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Electromagnetic Waves
Name which part of the electromagnetic spectrum is used for: a) Treating muscular strains b) To treatment of certain kinds of cancer c) Sterilizing Instruments
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Electromagnetic Waves
Answer the following: a) Which part of the electromagnetic spectrum has largest penetrating power? b) Which part of the electromagnetic spectrum has highest frequency?
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Electromagnetic Waves
Find the ratio of the speeds of infra red rays and gamma rays in vacuum?
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Electromagnetic Waves
State the uses of Infra Red Rays.
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Electromagnetic Waves
What is visible spectrum?
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Electromagnetic Waves
What is the wavelength of electromagnetic wave of frequency 4 X 109 Hz in free space? Also state its applications.
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Electromagnetic Waves
What is electromagnetic spectrum?
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Electromagnetic Waves
How are infrared waves produced? Why are these referred to as 'heat waves'? Write their one important use.
Asked by Topperlearning User
20th May 2014,
9:07 AM
CBSE - XII Science - Physics - Electromagnetic Waves
Which of the following has the shortest wavelength ? Microwave, Ultraviolet rays, X-rays
Asked by Topperlearning User
20th May 2014,
9:01 AM
CBSE - XII Science - Physics - Electromagnetic Waves
Is the ratio of frequencies of ultraviolet rays and infrared rays in glass more than, less than or equal to 1 ?
Asked by Topperlearning User
20th May 2014,
8:59 AM
CBSE - XII Science - Physics - Electromagnetic Waves
The frequency values 
and 
for two spectral lines of the EM spectrum are found as 5 x 1020 Hz and 2.5 x 1011 Hz respectively. Find the ratio 
of their wavelengths.
and for two spectral lines of the EM spectrum are found as 5 x 1020 Hz and 2.5 x 1011 Hz respectively. Find the ratio of their wavelengths.
Asked by Topperlearning User
19th May 2014,
4:44 PM
CBSE - XII Science - Physics - Electromagnetic Waves
Find the wavelength of electromagnetic waves of frequency 6 × 1012 Hz in free space. Give its two applications.
Asked by Topperlearning User
19th May 2014,
4:37 PM
CBSE - XII Science - Physics - Electromagnetic Waves
Write the physical limit of visible range of electromagnetic spectrum in kHz.
Asked by Topperlearning User
19th May 2014,
4:34 PM
CBSE - XII Science - Physics - Electromagnetic Waves
Identify the following electromagnetic radiations as per the frequencies given below : (a) 1020 Hz (b) 109 Hz (c)1011 Hz Give one application of each.
Asked by Topperlearning User
21st March 2014,
3:38 PM
CBSE - XII Science - Physics - Electromagnetic Waves
Identify the following electromagnetic radiation as per the wavelength given below. (a) 10-3 nm (b) 10-3 m (c)1 nm Write one application of each
Asked by Topperlearning User
21st March 2014,
3:35 PM
