The correct match between the entries in column I and column II are : I II Radiation Wavelength a Microwave i 100 m b Gamma rays ii 10 - 15 m c A.M. radio iii 10 - 10 m d X–rays iv 10 - 3 m

(a)–(iv), (b) – (ii), (c) – (i), (d) – (iii)

(a)–(ii), (b) – (i), (c) – (iv), (d) – (iii)

(a)–(i), (b) – (iii), (c) – (iv), (d) – (ii)

(a)–(iii), (b) – (ii), (c) – (i), (d) – (iv)

waves associated with a moving particle under suitable conditions

The electric field of a plane electromagnetic wave is given by E → = E 0 x ^ + y ^ sin k z - ω t . Its magnetic field will be given by

E 0 c - x ^ + y ^ sin k z - ω t

EASY

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Sound wave is an example of a mechanical wave.

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Important Questions on Waves

MEDIUM

Physics>Oscillations and Waves>Waves>Classification of Waves

For an electromagnetic wave, which of the following statements is true?

EASY

Physics>Oscillations and Waves>Waves>Classification of Waves

The correct match between the entries in column I and column II are :

	I		II
	Radiation		Wavelength
a	Microwave	i	$100 m$
b	Gamma rays	ii	$10^{- 15} m$
c	A.M. radio	iii	$10^{- 10} m$
d	X–rays	iv	$10^{- 3} m$

EASY

Physics>Oscillations and Waves>Waves>Classification of Waves

A steel wire has a length of

90 cm

which is under a constant tension of

100 N .

The speed of the transverse waves that can be produced in the wire will be (take the mass of the steel wire to be

6 \times 10^{- 3} kg

)

EASY

Physics>Oscillations and Waves>Waves>Classification of Waves

Matter waves are

MEDIUM

Physics>Oscillations and Waves>Waves>Classification of Waves

Given below in the left column are different modes of communication using the kinds of waves given in the right column.

(1) Optical Fibre Communication	(P) Ultrasound
(2) Radar	(Q) Infrared Light
(3) Sonar	(R) Microwaves
(4) Mobile Phones	(S) Radio Waves

From the options given below, find the most appropriate match between entries in the left and the right column.

MEDIUM

Physics>Oscillations and Waves>Waves>Classification of Waves

If the uncertainty in the position of an electron is

10^{- 10} m,

then the value of uncertainty in its momentum will be _____

kg {ms}^{- 1} . (h = 6.62 \times 10^{- 34} J^{- s})

EASY

Physics>Oscillations and Waves>Waves>Classification of Waves

An electron is constrained to move along the

y

-axis with a speed of

0.1 c

(c is the speed of light) in the presence of electromagnetic wave, whose electric field is

\vec{E} = 30 \hat{j} \sin (1.5 \times 10^{7} t - 5 \times 10^{- 2} x) V m^{- 1} .

where

t

is in seconds and

x

is in meters. The maximum magnetic force experienced by the electron will be: (given

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

and electron charge

= 1.6 \times 10^{- 19} C

EASY

Physics>Oscillations and Waves>Waves>Classification of Waves

In a resonance tube experiment when the tube is filled with water up to a height of

17.0 cm,

from bottom, it resonates with a given tuning fork. When the water level is raised the next resonance with the same tuning fork occurs at a height of

24.5 cm .

If the velocity of sound in air is

330 m s^{- 1},

the tuning fork frequency is :

MEDIUM

Physics>Oscillations and Waves>Waves>Classification of Waves

A transverse wave travels on a taut steel wire with a velocity of

v

when tension in it is

2.06 \times 10^{4} N .

When the tension is changed to

T,

the velocity changed to

\frac{v}{2} .

The value of

T

is close to:

MEDIUM

Physics>Oscillations and Waves>Waves>Classification of Waves

The electric field of a plane electromagnetic wave is given by $\vec{E} = E_{0} (\hat{x} + \hat{y}) \sin (k z - ω t)$ . Its magnetic field will be given by

MEDIUM

Physics>Oscillations and Waves>Waves>Classification of Waves

The magnetic field in a travelling electromagnetic wave has a peak value of

20 nT

. The peak value of electric field strength is,

EASY

Physics>Oscillations and Waves>Waves>Classification of Waves

When a sound wave is reflected from the boundary of a denser medium, the compression of the incident wave is returned as:

MEDIUM

Physics>Oscillations and Waves>Waves>Classification of Waves

Assume that the displacement

(s)

of air is proportional to the pressure difference

(Δ p)

created by a sound wave. Displacement

(s)

further depends on the speed of sound

(v)

, density of air

(ρ)

and the frequency

(f)

. If

Δ p = 10 Pa, n = 300 m s^{- 1}, p = 1 kg m^{- 3}

and

f = 1000 Hz

, then

s

will be of the order of (take the multiplicative constant to be

1

)

EASY

Physics>Oscillations and Waves>Waves>Classification of Waves

In Raman scattering, Stokes and Antistokes lines respectively represents lines with ______ and ______ wavelength.

MEDIUM

Physics>Oscillations and Waves>Waves>Classification of Waves

The driver of bus approaching a big wall notices that the frequency of his bus's horn changes from

420 Hz

490 Hz

when he hears it after it gets reflected from the wall. Find the speed of the bus if speed of the sound is

330 {ms}^{- 1}

EASY

Physics>Oscillations and Waves>Waves>Classification of Waves

A pendulum vibrates with a time period of

1

second. The sound produced in it is in the range of

MEDIUM

Physics>Oscillations and Waves>Waves>Classification of Waves

An object was found to make oscillations governed by the equation

y = \cos^{2} (ω t + \frac{π}{4}) - 0.5

. The amplitude and angular frequency of these oscillations, respectively, are

EASY

Physics>Oscillations and Waves>Waves>Classification of Waves

The electric field of a plane electromagnetic wave propagating along the x direction in vacuum is

\vec{E} = E_{0} jcos (ω t - kx) .

The magnetic field

\vec{B},

at the moment

t = 0

is:

HARD

Physics>Oscillations and Waves>Waves>Classification of Waves

A horizontal stretched string, fixed at two ends, is vibrating in its fifth harmonic according to the equation,

y (x, t) = (0 .01 m) sin [(62.8 m^{-1}) x] cos [(628 s^{-1}) t]

. Assuming

π = 3.14

, the correct statement(s) is (are):

MEDIUM

Physics>Oscillations and Waves>Waves>Classification of Waves

A sonometer wire 1 metre along weighing

2 g

is in resonance with a tuning fork of frequency

300 Hz

Find tension in the sonometer wire.

Sound wave is an example of a mechanical wave.

Important Questions on Waves

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