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

E M B I B E

Physics Crash Course NEET>Chapter 11 - Waves>Level 1>Q 69

MEDIUM

NEET

IMPORTANT

Earn 100

A source of sound emits sound waves at frequency $f_{0}$ . It is moving towards an observer with fixed speed $v_{s} (v_{s} < v)$ , where $v$ is the speed of sound in air). If the observer were to move towards the source with speed $v_{0}$ , one of the following two graphs (A and B) will give the correct variation of the frequency $f$ heard by the observer as $v_{0}$ is changed.

The variation of $f$ with $v_{0}$ is given correctly by:

50% studentsanswered this correctly

Important Questions on Waves

MEDIUM

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 11 - Waves>Level 1>Q 70

A musician using an open flute of length

50 cm

produces second harmonic sound waves. A person runs towards the musician from another end of a hall at a speed of

10 km h^{- 1}

. If the wave speed is

330 m s^{- 1}

, the frequency heard by the running person shall be close to

EASY

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 11 - Waves>Level 1>Q 71

If the bulk modulus of water is

2100 MPa,

then speed of sound in water is (take the density of water,

ρ = 1000 kg m^{- 3}

)

EASY

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 11 - Waves>Level 1>Q 72

According to Newton, sound propagation in a gas takes under

EASY

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 11 - Waves>Level 1>Q 73

Bass control in stereo system increases the power of

EASY

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 11 - Waves>Level 2>Q 1

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	$10^{- 3} m$

MEDIUM

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 11 - Waves>Level 2>Q 2

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

EASY

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 11 - Waves>Level 2>Q 3

A uniform thin rope of length

12 m

and mass

6 kg

hangs vertically from a rigid support and a block of mass

2 kg

is attached to its free end. A transverse short wave train of wavelength

6 cm

is produced at the lower and the rope. What is the wavelength of the wave train (in

cm

) when it reaches the top of the rope?

EASY

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 11 - Waves>Level 2>Q 4

$x_{1} = 12 \sin (484 π t - 7 π x)$ and $x_{2} = 12 \sin (480 π t - 7 π x)$ represent the equations of two sound waves. When sounded together, find the beat frequency produced.

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