Physics Standard 11 Vol II>Chapter 11 - Waves>EVALUATION>Q I

MEDIUM

11th Tamil Nadu Board

IMPORTANT

Earn 100

A student tunes his guitar by striking a $120$ Hertz with a tuning fork, and simultaneously plays the $4 th$ string on his guitar. By keen observation, he hears the amplitude of the combined sound oscillating thrice per second. Which of the following frequencies is the most likely the frequency of the $4 th$ string on his guitar?

50% studentsanswered this correctly

Important Questions on Waves

MEDIUM

11th Tamil Nadu Board

IMPORTANT

Physics Standard 11 Vol II>Chapter 11 - Waves>EVALUATION>Q I

A transverse wave moves from a medium

A

to a medium

B

. In medium A, the velocity of the transverse wave is

500 {ms}^{- 1}

and the wavelength is

5 m

. The frequency and the wavelength of the wave in medium

B

when its velocity is

600 {ms}^{- 1}

, respectively are:

MEDIUM

11th Tamil Nadu Board

IMPORTANT

Physics Standard 11 Vol II>Chapter 11 - Waves>EVALUATION>Q I

For a particular tube, among six harmonic frequencies below

1000 Hz

, only four harmonic frequencies are given :

300 Hz, 600 Hz, 750 Hz

and

900 Hz

. What are the two other frequencies missing from this list?.

MEDIUM

11th Tamil Nadu Board

IMPORTANT

Physics Standard 11 Vol II>Chapter 11 - Waves>EVALUATION>Q I

Which of the following options is correct?

Question Image

Options for (1), (2) and (3) respectively are

EASY

11th Tamil Nadu Board

IMPORTANT

Physics Standard 11 Vol II>Chapter 11 - Waves>EVALUATION>Q I

Equation of travelling wave on a stretched string of linear density

5 g / m

is

y = 0.03 \sin (450 t - 9 x)

, where distance and time are measured in SI units. The tension in the string is

EASY

11th Tamil Nadu Board

IMPORTANT

Physics Standard 11 Vol II>Chapter 11 - Waves>EVALUATION>Q I

A sound wave whose frequency is $5000 Hz$ travels in air and then hits the water surface. The ratio of its wavelengths in water and air is

(Velocity of sound in air is $343 m / s$ , velocity of sound in water is $1480 m / s$ )

MEDIUM

11th Tamil Nadu Board

IMPORTANT

Physics Standard 11 Vol II>Chapter 11 - Waves>EVALUATION>Q I

A person standing between two parallel hills fires a gun and hears the first echo after

t_{1} \sec

and the second echo after

t_{2} \sec

. The distance between the two hills is

MEDIUM

11th Tamil Nadu Board

IMPORTANT

Physics Standard 11 Vol II>Chapter 11 - Waves>EVALUATION>Q I

An air column in a pipe which is closed at one end, will be in resonance with the vibrating body of frequency

83 Hz

. Assuming velocity of sound in air to be

343 m / s

, the length of the air column is

EASY

11th Tamil Nadu Board

IMPORTANT

Physics Standard 11 Vol II>Chapter 11 - Waves>EVALUATION>Q I

The displacement

y

of a wave travelling in the

x

direction is given by

y = (2 \times 10^{- 3})

\sin (300 t - 2 x + π / 4)

, where

x

and $y$ are measured in metres and $t$ in second. The speed of the wave is