Match the following: Column - I Column - II (a) Transverse wave through a steel rod (i) B + 4 3 η ρ (b) Longitudinal waves in earth's crust (ii) η ρ (c) Longitudinal waves through a steel rod (iii) 2 π T g λ (d) Ripples (iv) λ ρ

( a − i i ) , ( b − i ) , ( c − i v ) , ( d − i i i )

( a − i ) , ( b − i i i ) , ( c − i v ) , ( d − i i )

( a − i i i ) , ( b − i v ) , ( c − i ) , ( d − i i )

( a − i i ) , ( b − i v ) , ( c − i ) , ( d − i i i )

A typical plane electromagnetic wave propagating along the Z - direction is shown in figure. Write the equation for electric and magnetic fields.

Electromagnetic waves are also known as EM waves. Electromagnetic radiations are composed of electromagnetic waves that are produced when an electric field comes in contact with the magnetic field. It can also be said that electromagnetic waves are the composition of oscillating electric and magnetic fields. A plane Electromagnetic wave travelling in the Z-direction is of the form E z , t = E max cos kz - ωt + ϕ and B z , t = B max cos kz - ωt + ϕ Where E , is the electric field and B , is the magnetic field vector of the electromagnetic waves.For electromagnetic waves E and B , are perpendicular to each other and perpendicular to the direction of propagation.The direction of propagation is the direction of E × B .

The electric field of a plane polarized electromagnetic wave in free space at t = 0 is E → x , z = 10 j ^ cos 6 x + 8 z . Then B → x , z is ( c is speed of light)

- 8 i ^ + 6 k ^ c cos ( 6 x + 8 z )

8 i ^ + 6 k ^ c cos ( 6 x + 8 z )

8 i ^ - 6 j ^ c sin ( 6 x + 8 z )

Match the following: Column A Column B 1 Excited atom of small atomic number with a vacancy in M –shell (p) β - rays . 2 Excited atom of large atomic number with a vacancy in K –shell (q) Infra–red rays. 3 Electron – positron annihilation (r) X –rays. 4 Unstable nuclei (s) γ - rays

1 - q , 2 - r , 3 - s , 4 - p , s

1 - r , 2 - q , 3 - s , 4 - p , s

1 - s , 2 - r , 3 - q , s , 4 - p

EASY

Earn 100

Define - Compression and rarefaction.

Important Questions on Sound

MEDIUM

Physics>Waves and Oscillations>Sound>Transverse waves and Longitudinal waves

Match the following:

	Column $- I$		Column $- II$
(a)	Transverse wave through a steel rod	(i)	$\sqrt{B + (\frac{4}{3}) \frac{η}{ρ}}$
(b)	Longitudinal waves in earth's crust	(ii)	$\sqrt{\frac{η}{ρ}}$
(c)	Longitudinal waves through a steel rod	(iii)	$\sqrt{\frac{2 π T}{g λ}}$
(d)	Ripples	(iv)	$\sqrt{\frac{λ}{ρ}}$

EASY

Physics>Waves and Oscillations>Sound>Transverse waves and Longitudinal waves

Write two properties and two uses of X-rays.

EASY

Physics>Waves and Oscillations>Sound>Transverse waves and Longitudinal waves

A typical plane electromagnetic wave propagating along the $Z$ - direction is shown in figure.

Question Image

Write the equation for electric and magnetic fields.

EASY

Physics>Waves and Oscillations>Sound>Transverse waves and Longitudinal waves

To propagate both longitudinal and transverse waves, a material must have

EASY

Physics>Waves and Oscillations>Sound>Transverse waves and Longitudinal waves

A man stands in a narrow, steep-sided valley. When he shouts he hears two echoes, one after 1 s and other after 2 s. If the velocity of sound in air is

330 m / s,

the width of the valley is

EASY

Physics>Waves and Oscillations>Sound>Transverse waves and Longitudinal waves

Which of the following functions represent a wave?

EASY

Physics>Waves and Oscillations>Sound>Transverse waves and Longitudinal waves

Can transverse wave be produce in air?

EASY

Physics>Waves and Oscillations>Sound>Transverse waves and Longitudinal waves

What type of waves are produced on the water surface?

EASY

Physics>Waves and Oscillations>Sound>Transverse waves and Longitudinal waves

The electric field of a plane polarized electromagnetic wave in free space at

t = 0

\vec{E} (x, z) = (10 \hat{j}) \cos (6 x + 8 z) .

Then

\vec{B} (x, z)

is (

c

is speed of light)

EASY

Physics>Waves and Oscillations>Sound>Transverse waves and Longitudinal waves

Unpolarized light of intensity

I_{0}

is incident on surface of a block of glass at Brewster's angle. In that case, which one of the following statements is true?

EASY

Physics>Waves and Oscillations>Sound>Transverse waves and Longitudinal waves

Consider an

E M

wave with magnetic field

B = 10^{- 4} s i n (w t - k x) .

The maximum value of its electric field in SI units is

EASY

Physics>Waves and Oscillations>Sound>Transverse waves and Longitudinal waves

The velocity of sound in air is

330 m s^{- 1}

and the velocity of light in air is

3 \times 10^{8} m s^{- 1}

. What frequency, in Hz does a BBC station which transmits at

1500 m

broadcast?

EASY

Physics>Waves and Oscillations>Sound>Transverse waves and Longitudinal waves

What type of waves are produced in a sitar wire?

MEDIUM

Physics>Waves and Oscillations>Sound>Transverse waves and Longitudinal waves

Match the following:

	Column A		Column B
1	Excited atom of small atomic number with a vacancy in $M$ –shell	(p)	$β$ -rays.
2	Excited atom of large atomic number with a vacancy in $K$ –shell	(q)	Infra–red rays.
3	Electron – positron annihilation	(r)	$X$ –rays.
4	Unstable nuclei	(s)	$γ$ - rays

MEDIUM

Physics>Waves and Oscillations>Sound>Transverse waves and Longitudinal waves

In the experiment for the determination of the speed of sound in air using the resonance column method, the length of the air column that resonates in the fundamental mode with a tuning fork is 0.1 m. When this length is changed to 0.35 m, the same tuning fork resonates with the first overtone. The end correction is

EASY

Physics>Waves and Oscillations>Sound>Transverse waves and Longitudinal waves

Which of the following is the example of transverse wave

EASY

Physics>Waves and Oscillations>Sound>Transverse waves and Longitudinal waves

A sonometer wire 100 cm long has a fundamental frequency of 330 Hz. The velocity of propagation of transverse waves on the wire is

MEDIUM

Physics>Waves and Oscillations>Sound>Transverse waves and Longitudinal waves

Earthquakes generate sound waves inside the earth. Unlike a gas, the earth can experience both transverse ( $S$ ) and longitudinal ( $P$ ) sound waves. Typically the speed of $S$ wave is about $4 .0 {kms}^{- 1}$ , and that of $P$ wave is $8 .0 {kms}^{- 1}$ . A seismograph records $P$ and $S$ waves from an earthquake. The first $P$ wave arrives $4 \min$ before the first $S$ wave. Assuming the waves travel in straight line, at what distance does the earthquake occur?

MEDIUM

Physics>Waves and Oscillations>Sound>Transverse waves and Longitudinal waves

The sound wave was produced in a gas is always

EASY

Physics>Waves and Oscillations>Sound>Transverse waves and Longitudinal waves

Due to the propagation of the longitudinal waves in a medium, the following quantities also propagate in the same direction

Define - Compression and rarefaction.

Important Questions on Sound

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