waves associated with a moving particle under suitable conditions

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

Both electric and magnetic fields vary

Electric field is constant and magnetic field varies.

Magnetic field is constant and electric field varies.

Both electric and magnetic fields are constant.

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A source of sound gives $5$ beats per second when sounded with another source of frequency $100 s^{- 1} .$ The second harmonic of the source together with a source of frequency $205 s^{- 1}$ gives $5$ beats per second. The frequency of the source is

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Important Questions on Waves

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Physics Crash Course NEET>Chapter 11 - Waves>Level 2>Q 20

When two tuning forks are sounded together,

x beats \sec^{- 1}

are heard and frequency of

A is n

. Now, when one prong of

B

is loaded with a little wax, the number of beats per second decreases. The frequency of fork

B

is,

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Physics Crash Course NEET>Chapter 11 - Waves>Level 2>Q 21

What is the beat frequency produced when following two waves are sounded together?

$x_{1} = 10 \sin (404 π t - 5 π x), x_{2} = 10 \sin (400 π t - 5 π x)$

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Physics Crash Course NEET>Chapter 11 - Waves>Level 2>Q 22

Two tuning forks A and B produce notes of frequencies

256 Hz

and

262 Hz

respectively. An unknown note sounded at the same time as A produces beats. When the same note is sounded with B, the beat frequency is twice as large. The unknown frequency could be

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Physics Crash Course NEET>Chapter 11 - Waves>Level 2>Q 23

A sonometer wire of length

1 .5 m

is made of steel. The tension in it produces an elastic strain of

1%

. What is the fundamental frequency of steel if density and elasticity of steel are

7 .7 \times 10^{3} kg m^{- 3}

and

2 .2 \times 10^{11} N m^{- 2}

respectively?

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Physics Crash Course NEET>Chapter 11 - Waves>Level 2>Q 24

A wire of length

2 L,

is made by joining two wires

A

and

B

of same length but different radii

r

and

2 r

and made of the same material. It is vibrating at a frequency such that the joint of the two wires forms a node. If the number of antinodes in wire

A

p

and that in

B

q

then ratio

p : q

is:

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Physics Crash Course NEET>Chapter 11 - Waves>Level 2>Q 25

A string

2.0 m

long and fixed at its ends is driven by a

240 H z

vibrator. The string vibrates in its third harmonic mode. The speed of the wave and its fundamental frequency is

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Physics Crash Course NEET>Chapter 11 - Waves>Level 2>Q 26

A granite rod of

60 cm

length is clamped at its middle point and is set into longitudinal vibrations. The density of granite is

2.7 \times 10^{3} kg m^{- 3}

and its Young's modulus is

9.27 \times 10^{10} Pa

. What will be the fundamental frequency of the longitudinal vibrations?

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Physics Crash Course NEET>Chapter 11 - Waves>Level 2>Q 27

Two wires

W_{1}

and

W_{2}

have the same radius

r

and respective, densities

ρ_{1}

and

ρ_{2}

, such that

ρ_{2} = 4 ρ_{1}

. They are joined together at the point

O

, as shown in the figure. The combination is used as a sonometer wire and kept under tension

T

. The point

O

is midway between the two bridges. When a stationary wave is set up in the composite wire, the joint is found to be a node. The ratio of the number of antinodes formed in

W_{1}

W_{2}

A source of sound gives 5 beats per second when sounded with another source of frequency 100 s-1. The second harmonic of the source together with a source of frequency 205 s-1 gives 5 beats per second. The frequency of the source is

Important Questions on Waves

Learn and Prepare for any exam you want !

A source of sound gives $5$ beats per second when sounded with another source of frequency $100 s^{- 1} .$ The second harmonic of the source together with a source of frequency $205 s^{- 1}$ gives $5$ beats per second. The frequency of the source is