Plus Two Physics Chapter Wise Previous Questions Chapter 8 Electromagnetic Waves is part of Kerala Plus Two Physics Chapter Wise Previous Questions and Answers Kerala. Here we have given Plus Two Physics Chapter Wise Questions and Answers Chapter 8 Electromagnetic Waves.
Kerala Plus Two Physics Chapter Wise Previous Questions and Answers Chapter 8 Electromagnetic Waves
a. Name the part of electromagnetic spectrum:
1. used in radar systems.
2. produced by bombarding a metal target by a high speed electrons.
b. Electromagnetic waves are produced by (charges at rest / charges in uniform motion/ charges in accelerated motion) c. Why only microwaves are used in microwave ovens? [March-2018]
a. 1. Radar Microscope
b. Charges in accelerated motion.
c. The frequency of microwaves is reflected to match the resonant frequency of water molecule, so that energy of waves is transformed to K.E of molecules, which rises the temeperature.
Choose the appropriate values for X -rays from given table. [March-2017]
|3 x 1017 Hz
3 x 108 Hz
3 x 1021 Hz
Wavelength – 1nm
Frequency – 3x 1017Hz
Match the following : [March-2016]
The electric field of a plane electromagnetic wave travelling in the +ve Z-direction is described by
a. Ex = E0 sin (kz + cat)
b. Ex = E0 sin (kz – cat)
c. Ex = E0 sin (2kz) .
d. Ex = E0 sin (kz)
ii. We feel excessive sweating on a ‘ cloudy day. Why ? [March-2015]
i. b. Ex = E0sin (kz – rot) ‘
ii. The clouds prevents IR radiation from passing through and thus keeps the earth’s surface warm.’
a. When a low flying aircraft passes over head, we sometimes notice a slight, shaking of the picture on our TV screen. Identify the optical phenomenon behind it.
b. In electro magnetic spectra, the wave length and frequencies are inversely related. A radio can tune in to any station in the 7.5 MHz to 12 MHz band. Determine the corresponding wave length band. [March-2014]
Electromagnetic spectrum is an orderly arrangement of electromagnetic radiations in the ascending or descending order of frequency / wave length.
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. [March-2013]
a. Microwaves, infrared, visible, x-rays
b. Infrared – Mobile phone (Bluetooth), TV, Video recorders.
X-ray – Detect’the fracture of bones.
The orderly distribution of EM radiations according to their wavelength or frequency is called E.M. spectrum. Identify the constituent radiation of EM spectrum which
i. is used for studying crystal structure.
ii. is absorbed by the ozone layer in the atmosphere.
iii. produce green house effect.
iv. used in medicine to destroy cancer cells. [March-2012]
iii. IR rays
iv. x-rays or gamma rays
a. Name the electromagnetic waves used for the following applications:
b. Imaging of bones in human body.
c. Mobile phone communication.
d. Remote control of T.V sets.
For sterilizing surgical instruments. [March-2011]
b. Radio waves
c. Infrared rays
d. Ultraviolet rays
Sun is a very powerful source of UV . rays. But we do not receive much ultraviolet rays on the surface of the Earth. Why? [Say-2007]
b. The electric field of an ultra violet ray is given by E=60 sin [0.5 × 103+1.5 × 10nt]. What is the amplitude of the magnetic field vector in the UV ray?
a. Ozone prevents the U.V ray.
In an electromagnetic wave electric and magnetic field vectors are given by
E = 120 sin (ωt + Kx ) ,
B = 40 × 108 Sin (cot + Kx)
a. What is the direction of propagation of electro magnetic wave?
b. Determine the ratio of amplitude of electric field to magnetic field in the case of the above EM wave?
c. How can you relate the above ratio with μ0 and ε0? [March-2006]
a. Direction of propagation is perpendicular to both electric field and magnetic field, i.e., in Z-direction.
An electromagnetic wave consist of oscillating electric and magnetic fields.
a. If the fundamental source of a sound wave is a vibrating object, what is the fundamental source of an electro magnetic wave?
b. Write an expression for velocity of an electro magnetic wave in a medium of relative permittivity er and relative permeability μr.
c. Match the following. [Say-2005]
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