Physics Crash Course NEET>Chapter 11 - Waves>Level 2>Q 42

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IMPORTANT

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A train whistling at constant frequency $n$ is moving towards a station at a constant speed $V$ , then train goes past a stationary observer on the station. The frequency $n$ of the sound as heard by the observer is plotted as a function of time $t$ . Identify the correct curve.

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Important Questions on Waves

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

An accelerated charge

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Physics Crash Course NEET>Chapter 11 - Waves>Level 1>Q 7

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:

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Physics Crash Course NEET>Chapter 11 - Waves>Level 1>Q 8

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

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Physics Crash Course NEET>Chapter 11 - Waves>Level 2>Q 43

The apparent change in frequency of sound due to the relative motion between the observer and the source of sound is called

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Physics Crash Course NEET>Chapter 11 - Waves>Level 2>Q 47

When the stationary waves are formed, then

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

If two tuning forks

A

and

B

are sounded together, they produce

4

beats per second.

A

is then slightly loaded with wax, they produce same beats when sounded again. The frequency of

A

is

256 Hz

. The frequency of

B

will be :-

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

You are given four tuning forks, the lowest frequency of the forks is

300 Hz

. By striking two tuning forks at a time, any of

1, 2, 3, 5, 7

and

8

beat frequencies are heard. The possible frequencies of the other three forks are

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Physics Crash Course NEET>Chapter 11 - Waves>Level 3>Q 8

If

λ_{1}

,

λ_{2}

,

λ_{3}

are the wavelengths of the waves giving resonance in the fundamental, first and second overtone modes, respectively, in an open organ pipe, then the ratio of the wavelengths

λ_{1} : λ_{2} : λ_{3}

, is