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12th Physics weekly Test -2 ( Electromagnetic waves )

St. Britto Hr. Sec. School - Madurai

12th Physics weekly Test -2 ( Electromagnetic waves )-Aug 2020

Time : 1.30 Hours

Part - A

Multiple Choice Question - Answer All Question

Which of the following E.M waves has the longest wavelength?

Radio waves
IR
X-rays
visible

Electromagnetic waves are produced by

static charge
moving charge
an accelerating charge
chargeless particles

Absorption spectrum is the characteristic of the_____

emitting substance
absorbing substance
reflecting substance
penetrating substance

Th e electric and the magnetic field, associated with an electromagnetic wave, propagating along X axis can be represented by

\(\vec { E } ={ E }_{ 0 }\hat { j } \) and \(\vec { B } ={ B }_{ 0 }\hat { k } \)
\(\vec { E } ={ E }_{ 0 }\hat { k } \) and \(\vec { B } ={ B }_{ 0 }\hat { j } \)
\(\vec { E } ={ E }_{ 0 }\hat { i } \) and \(\vec { B } ={ B }_{ 0 }\hat { j } \)
\(\vec { E } ={ E }_{ 0 }\hat { j } \) and \(\vec { B } ={ B }_{ 0 }\hat { i } \)

Which one of them is used to produce a propagating electromagnetic wave?.

an accelerating charge
a charge moving at constant velocity
a stationary charge
an uncharged particle

The electromagnetic waves are __________ by electric and magnetic fields

deflected
not deflected
oscillated
scanned

Which of the following is used to study crystal structure?

microwave
infrared rays
ultraviolet rays
X-rays

A pure green glass plate when, placed in the path of white light, absorbs________.

everything
everything except green
nothing
only red

The frequency range of radio-waves is _________.

3 x 10⁷ to 3 X 10¹⁴ Hz
3 x 10¹⁷ to 3 x 10¹⁴Hz
3 x 10⁷ to 3 X 10⁴ Hz
3 x 10¹⁷ to 3 X 10⁴ Hz

Microwaves are used in _______ communication system.

radio
TV
radar
sonar

Electromagnetic waves are _________ in nature .

parallel
transverse
longitudinal
Uni-directional

An electromagnetic wave has 5 joules of electric energy. The magnetic energy is

zero
5 J
10 J
2.5 J

Which of the following gives rise to continuous emission spectrum?

electric filament lamp
sodium vapour lamp
gases in the discharge tube
calcium salt in Bunsen flame

The waves used in physiotherapy is ___________.

I-R rays
U-V rays
μ - waves
૪-rays

Television waves range from

54 MHz to 89 MHz
54 MHz to 890 MHz
54 MHz to 89 MHz
54 MHz to 80 MHz

Forged documents are detected through ________.

X-rays
UV-rays
IR-rays
microwaves

Dimensions of \(\frac { 1 }{ { \mu }_{ 0 }{ \varepsilon }_{ 0 } } \) is

\(\frac { { L }^{ 2 } }{ { T }^{ 2 } } \)
\(\frac { { T }^{ 2 } }{ { L }^{ 2 } } \)
\(\frac { T }{ L } \)
\(\frac { L }{ T } \)

The central core of the sun is called

chromosphere
stratosphere
photosphere
thermo sphere

Speed of electromagnetic waves through vacuum is equal to

\(\sqrt { { \mu }_{ 0 }{ \varepsilon }_{ 0 } } \)
\(\frac { 1 }{ \sqrt { { \mu }_{ 0 }{ \varepsilon }_{ 0 } } } \)
\(\\ \frac { \sqrt { { \mu }_{ 0 } } }{ { \varepsilon }_{ 0 } } \)
\(\sqrt { \frac { { \varepsilon }_{ 0 } }{ { \mu }_{ 0 } } } \)

________ absorption spectrum are used to study molecular structure.

UV rays
IR
X-rays
૪-rays

Part - B

Generic 5 - Answer All Question

A magnetron in a microwave oven emits electromagnetic waves (em waves) with frequency f = 2450 MHz. What magnetic field strength is required for electrons to move in circular paths with this frequency?.

Compute the speed of the electromagnetic wave in a medium if the amplitude of electric and magnetic fields are 3 × 10⁴ NC^-1 and 2 × 10^-4 T, respectively.

A transmitter consists of LC circuit with an inductance of 1 μH and a capacitance of 1 μF. What is the wavelength of the electromagnetic waves it emits?

In an Electromagnetic wave propagating along X - direction, the magnetic field osciallates at a frequency. 5 x 10⁸ Hz and has an amplitude of 10^-7 tesla, acting along the Y-direction.
(i) What is the wavelength of the wave?
(ii) Write the expression representing the corresponding oscillating electric field.

Let an electromagnetic wave propagate along the x direction, the magnetic field oscillates at a frequency of 10¹⁰ Hz and has an amplitude of 10⁻⁵ T, acting along the y - direction. Then, compute the wavelength of the wave. Also write down the expression for electric field in this case.

Use the formula E = h૪ (for energy of a quantum of radiation photon) and obtain the photon energy in units of ev for different parts of the Electromagnetic spectrum. In what ways are the different scales of photon energies that you obtain related to the sources of Electromagnetic radiation?

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