12th Physics Monthly Test - 2 ( Electromagnetic waves )

St. Britto Hr. Sec. School - Madurai

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

Time : 2.30 Hours

Part - A

Generic 2 - Answer All Question

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

(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?

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

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

What are 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 is meant by Fraunhofer lines?

What is displacement current?

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

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.

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

Explain the concept of intensity of electromagnetic waves.

What is the orgin of displacement currtent?

Write the uses of Micro waves.

Write the uses of Radio waves.

Part - B

Generic 5 - Answer All Question

If the relative permeability and relative permittivity of the medium is 1.0 and 2.25, respectively. Find the speed of the electromagnetic wave in this medium.

An electromagnetic wave is traveling in vacuum with a speed 3 x 10⁸ m/s. find its velocity in a medium having relative electric and magnetic permeability 2 and 1respectively.

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

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.

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 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?.

Write down Maxwell equations in integral form.

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?

Consider a parallel plate capacitor whose plates are closely spaced. Let R be the radius of the plates and the current in the wire connected to the plates is 5 A, calculate the displacement current through the surface passing between the plates by directly calculating the rate of change of flux of electric field through the surface.

In which way you can establish an instantaneous displacement current of 1.0 A in the space between the parallel plates of 1μf capacitor?

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?

The oscillating magnetic field in a plane Electromagnetic wave is given by
B = (8 x 10^-6) sin (2 x 10¹¹t + 300 πx) T
(i) Calculate the λ of Electromagnetic wave.
(ii) Find the amplitude of electric field.

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?
A parallel plate capacitor is charged by an external ac source straight the displacement current inside the capacitor is the same as the current charging the capacitor.

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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12th Physics Monthly Test - 2 ( Electromagnetic waves )

St. Britto Hr. Sec. School - Madurai

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

Part - A

Generic 2 - Answer All Question

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

(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?

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

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

What are 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 is meant by Fraunhofer lines?

What is displacement current?

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

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.

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

Explain the concept of intensity of electromagnetic waves.

What is the orgin of displacement currtent?

Write the uses of Micro waves.

Write the uses of Radio waves.

Part - B

Generic 5 - Answer All Question

If the relative permeability and relative permittivity of the medium is 1.0 and 2.25, respectively. Find the speed of the electromagnetic wave in this medium.

An electromagnetic wave is traveling in vacuum with a speed 3 x 108 m/s. find its velocity in a medium having relative electric and magnetic permeability 2 and 1respectively.

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

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.

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 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?.

Write down Maxwell equations in integral form.

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?

In which way you can establish an instantaneous displacement current of 1.0 A in the space between the parallel plates of 1μf capacitor?

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?

The oscillating magnetic field in a plane Electromagnetic wave is given by B = (8 x 10-6) sin (2 x 1011 t + 300 πx) T (i) Calculate the λ of Electromagnetic wave. (ii) Find the amplitude of electric field.

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?

A parallel plate capacitor is charged by an external ac source straight the displacement current inside the capacitor is the same as the current charging the capacitor.

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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(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?

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.

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.

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

An electromagnetic wave is traveling in vacuum with a speed 3 x 10⁸ m/s. find its velocity in a medium having relative electric and magnetic permeability 2 and 1respectively.

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.

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.

The oscillating magnetic field in a plane Electromagnetic wave is given by
B = (8 x 10^-6) sin (2 x 10¹¹t + 300 πx) T
(i) Calculate the λ of Electromagnetic wave.
(ii) Find the amplitude of electric field.