12th Physics Monthly Test - 1 ( Electromagnetic waves )

St. Britto Hr. Sec. School - Madurai

12th Physics Monthly Test - 1 ( Electromagnetic waves )-Aug 2020

Time : 2.30 Hours

Part - A

Multiple Choice Question - Answer All Question

________ radiations are used to study atomic structure.

UV
IR
X-rays
Gamma

In an electromagnetic wave in free space the rms value of the electric fi eld is 3 V m⁻¹. The peak value of the magnetic field is

1.414 × 10^-8 T
1.0 × 10^-8 T
2.828 × 10^-8 T
2.0 × 10^-8 T

In E.M. waves, the variations in electric and magnetic fields are at an angle of________.

0°
60°
90°
270°

Accelerated charges would produce

sound waves
૪-rays
magnetic waves
electromagnetic waves

Forged documents are detected through ________.

X-rays
UV-rays
IR-rays
microwaves

________ lamps are used in physiotherapy.

IR
UV
visible
૪-rays

If the amplitude of the magnetic field is 3 x 10^-6 T, then amplitude of the electric field for a electromagnetic waves is

100 V m^-1
300 V m^-1
600 V m^-1
900 V m^-1

Calcium or Barium salts in bunsen flame, CO₂, N₂ molecule, NH₃ gas in a discharge tube gives_______.
line emission spectra

continuous emission spectra

line absorption spectra

band spectra
If the magnetic monopole exists, then which of the Maxwell’s equation to be modified?.
\(\oint { \vec { E } .d\vec { A } } =\frac { { Q }_{ enclosed } }{ { \in }_{ 0 } } \)

\(\oint { \vec { E } .d\vec { A } } \)=0

\(\oint { \vec { E } .d\vec { A } } ={ \mu }_{ 0 }{ I }_{ enclosed }+{ \mu }_{ 0 }{ \in }_{ 0 }\frac { d }{ dt } \oint { \vec { E } .d\vec { A } } \)

\(\oint { \vec { E } .d\vec { l } } =-\frac { d }{ dt } { \Phi }_{ B }\)

The dark lines in the solar spectrum are called _______ lines.

Fresnel
Newton
Compton
Fraunhofer

The electric and magnetic fields of an electromagnetic wave are

in phase and perpendicular to each other
out of phase and not perpendicular to each other
in phase and not perpendicular to each other
out of phase and perpendicular to each other

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 \(\vec { B } ={ B }_{ 0 }\hat { i } \)

Carbon arc produces ________ spectrum.

characteristic
line
band
continuous

Which of the following electromagnetic waves has the highest frequency?

radio waves
micro waves
X- rays
૪-rays

The frequency range ofUV rays is__________ Hz

3 x 10¹⁸ to 10¹⁶
5 x 10⁵ to 8 X 10⁹
5 X 10¹⁷ to 8 X 10¹⁴
5 x 10¹⁴ to 8 X 10¹⁰

_________ are used in forensic labs.

X-ray
UV
Gamma
Visible

Part - B

Generic 2 - Answer All Question

Which part of Electromagnetic is absorbed from sunlight by ozone layer?
(i) Write its source and
(ii) mention its uses.

What is displacement current?

Draw a diagram depicting oscillating electric and magnetic field of an electromagnetic wave.

Write down the integral form of modified Ampere’s circuital law.

Explain the concept of intensity of electromagnetic waves.

(i) In which situation is there a displacement current but no conduction current?
(ii) Find the displacement current across the plate of the capacitor whose charging current is 0.25 A.

What are electromagnetic waves?

Arrange the Electromagnetic waves in order of
(i) increasing frequency
(ii) decreasing wavelength.

(i) How is the speed of Electromagnetic waves in vacuum determined by the electric and magnetic fields? and
(ii) Do Electromagnetic waves carry energy and momentum?

What is meant by Fraunhofer lines?

Which part of the Electromagnetic spetrum spectrum is used in operating a RADAR and why?

Write the uses of Radio waves.

Why are Infra~ed radiation referred as heat waves? Name the radiations, which are next to these radiation having
(i) shorter λ
(ii) longer λ.

What is the orgin of displacement currtent?

Write the uses of Micro waves.

Part - C

Generic 3 - Answer All Question

How does Ampere - Maxwell law expalain the flux of current trough a capacitor when it is being charged by a battery? write the expression for the displacement current in terms of the rate of change of electric flux.

A variable frequency ac source is connected to capacitor. How will the displacement current change with decrease in frequency.

Write down Maxwell equations in integral form.
Write short notes on
(a) microwave
(b) X-ray
(c) radio waves
(d) visible spectrum

Identify the following Electromagnetic radiations (a) 10⁹ Hz (b) 10¹¹ Hz. Give one application of each.

Write the generalised expression for the Ampere's circuital law in terms of I_c & I_d. Mention the situation when there is
(i) only conduction current &no displacement current (I_d).
(ii) only I_d&no I_c.

Discuss briefly the experiment conducted by Hertz to produce and detect electromagnetic spectrum.

What is absorption spectra?. Give their types.

The charge on a parallel plate capacitor varies as q=q_o cos 2\(\pi \gamma \)t. The plates are very large and close together. (area-A. separation - d) find the displacement current through the capacitor?
Write the uses of Infrared radiation

Write an expression for the momentum of Electromagnetic wave.

Explain the Maxwell’s modification of Ampere’s circuital law.

Part - D

Generic 5 - Answer All Question

In an electric circuit, there is a capacitor of reactance 100 Ω connected across the source of 220 V, find the displacement current.

A pulse of light of duration 10⁻⁶ s is absorbed completely by a small object initially at rest. If the power of the pulse is 60 × 10⁻³ W, calculate the final momentum of the object.

About 5 % of the power of a 100 W light bulb is connected to visible radiation. What is the average intensity of visible radiation at the distance of 1m from the bulb?
The magnetic field amplitude of an Electromagnetic wave is 1.6 x 10^-7 T. If the frequency is 30 MHz. determine electric field, any velocity K and λ.

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 plane Electromagnetic wave travels in vacuum along z - direction. What can you say about the directions of electric and magnetic field vectors? If the frequency of the wave is 30 MHz. What is its wavelength?

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12th Physics Monthly Test - 1 ( Electromagnetic waves )

St. Britto Hr. Sec. School - Madurai

12th Physics Monthly Test - 1 ( Electromagnetic waves )-Aug 2020

Part - A

Multiple Choice Question - Answer All Question

________ radiations are used to study atomic structure.

In an electromagnetic wave in free space the rms value of the electric fi eld is 3 V m−1. The peak value of the magnetic field is

In E.M. waves, the variations in electric and magnetic fields are at an angle of________.

Accelerated charges would produce

Forged documents are detected through ________.

________ lamps are used in physiotherapy.

If the amplitude of the magnetic field is 3 x 10-6 T, then amplitude of the electric field for a electromagnetic waves is

Calcium or Barium salts in bunsen flame, CO2, N2 molecule, NH3 gas in a discharge tube gives_______.

If the magnetic monopole exists, then which of the Maxwell’s equation to be modified?.

The dark lines in the solar spectrum are called _______ lines.

The electric and magnetic fields of an electromagnetic wave are

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

Carbon arc produces ________ spectrum.

Which of the following electromagnetic waves has the highest frequency?

The frequency range ofUV rays is__________ Hz

_________ are used in forensic labs.

Part - B

Generic 2 - Answer All Question

Which part of Electromagnetic is absorbed from sunlight by ozone layer? (i) Write its source and (ii) mention its uses.

What is displacement current?

Draw a diagram depicting oscillating electric and magnetic field of an electromagnetic wave.

Write down the integral form of modified Ampere’s circuital law.

Explain the concept of intensity of electromagnetic waves.

(i) In which situation is there a displacement current but no conduction current? (ii) Find the displacement current across the plate of the capacitor whose charging current is 0.25 A.

What are electromagnetic waves?

Arrange the Electromagnetic waves in order of (i) increasing frequency (ii) decreasing wavelength.

(i) How is the speed of Electromagnetic waves in vacuum determined by the electric and magnetic fields? and (ii) Do Electromagnetic waves carry energy and momentum?

What is meant by Fraunhofer lines?

Which part of the Electromagnetic spetrum spectrum is used in operating a RADAR and why?

Write the uses of Radio waves.

Why are Infra~ed radiation referred as heat waves? Name the radiations, which are next to these radiation having (i) shorter λ (ii) longer λ.

What is the orgin of displacement currtent?

Write the uses of Micro waves.

Part - C

Generic 3 - Answer All Question

How does Ampere - Maxwell law expalain the flux of current trough a capacitor when it is being charged by a battery? write the expression for the displacement current in terms of the rate of change of electric flux.

A variable frequency ac source is connected to capacitor. How will the displacement current change with decrease in frequency.

Write down Maxwell equations in integral form.

Write short notes on (a) microwave (b) X-ray (c) radio waves (d) visible spectrum

Identify the following Electromagnetic radiations (a) 109 Hz (b) 1011 Hz. Give one application of each.

Write the generalised expression for the Ampere's circuital law in terms of Ic & Id. Mention the situation when there is (i) only conduction current &no displacement current (Id). (ii) only Id&no Ic.

Discuss briefly the experiment conducted by Hertz to produce and detect electromagnetic spectrum.

What is absorption spectra?. Give their types.

The charge on a parallel plate capacitor varies as q=qo cos 2\(\pi \gamma \)t. The plates are very large and close together. (area-A. separation - d) find the displacement current through the capacitor?

Write the uses of Infrared radiation

Write an expression for the momentum of Electromagnetic wave.

Explain the Maxwell’s modification of Ampere’s circuital law.

Part - D

Generic 5 - Answer All Question

In an electric circuit, there is a capacitor of reactance 100 Ω connected across the source of 220 V, find the displacement current.

A pulse of light of duration 10−6 s is absorbed completely by a small object initially at rest. If the power of the pulse is 60 × 10−3 W, calculate the final momentum of the object.

About 5 % of the power of a 100 W light bulb is connected to visible radiation. What is the average intensity of visible radiation at the distance of 1m from the bulb?

The magnetic field amplitude of an Electromagnetic wave is 1.6 x 10-7 T. If the frequency is 30 MHz. determine electric field, any velocity K and λ.

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 plane Electromagnetic wave travels in vacuum along z - direction. What can you say about the directions of electric and magnetic field vectors? If the frequency of the wave is 30 MHz. What is its wavelength?

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12th Physics Monthly Test - 1 ( Electromagnetic In

In an electromagnetic wave in free space the rms value of the electric fi eld is 3 V m⁻¹. The peak value of the magnetic field is

If the amplitude of the magnetic field is 3 x 10^-6 T, then amplitude of the electric field for a electromagnetic waves is

Calcium or Barium salts in bunsen flame, CO₂, N₂ molecule, NH₃ gas in a discharge tube gives_______.

Which part of Electromagnetic is absorbed from sunlight by ozone layer?
(i) Write its source and
(ii) mention its uses.

(i) In which situation is there a displacement current but no conduction current?
(ii) Find the displacement current across the plate of the capacitor whose charging current is 0.25 A.

Arrange the Electromagnetic waves in order of
(i) increasing frequency
(ii) decreasing wavelength.

(i) How is the speed of Electromagnetic waves in vacuum determined by the electric and magnetic fields? and
(ii) Do Electromagnetic waves carry energy and momentum?

Why are Infra~ed radiation referred as heat waves? Name the radiations, which are next to these radiation having
(i) shorter λ
(ii) longer λ.

Write short notes on
(a) microwave
(b) X-ray
(c) radio waves
(d) visible spectrum

Identify the following Electromagnetic radiations (a) 10⁹ Hz (b) 10¹¹ Hz. Give one application of each.

Write the generalised expression for the Ampere's circuital law in terms of I_c & I_d. Mention the situation when there is
(i) only conduction current &no displacement current (I_d).
(ii) only I_d&no I_c.

The charge on a parallel plate capacitor varies as q=q_o cos 2\(\pi \gamma \)t. The plates are very large and close together. (area-A. separation - d) find the displacement current through the capacitor?

A pulse of light of duration 10⁻⁶ s is absorbed completely by a small object initially at rest. If the power of the pulse is 60 × 10⁻³ W, calculate the final momentum of the object.

The magnetic field amplitude of an Electromagnetic wave is 1.6 x 10^-7 T. If the frequency is 30 MHz. determine electric field, any velocity K and λ.

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.