Physics
Assertion (A): Sound travels faster in air than in liquids.
Reason (R): Particles are loosely packed in air in comparison to liquids.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true and R is not the correct explanation of A
- A is true but R is false
- A is false but R is true
Answer
A is false but R is true
Explanation
Assertion (A) is false because sound does not travel faster in air than in liquids but it travels faster in liquids because particles are closer together and transmit vibrations more efficiently.
Reason (R) is true because particles in air are more loosely packed compared to liquids due to less intermolecular forces.
Therefore, A is false but R is true.
Related Questions
…………… is called the voice box of humans.
- throat
- nose
- mouth
- larynx
Assertion (A): For echo, sound should travel a minimum distance of atleast 33 m in air.
Reason (R): Distinct echo requires a minimum time delay of 0.1 s.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true and R is not the correct explanation of A
- A is true but R is false
- A is false but R is true
Fill in the blanks:
(a) Sound is produced when a body …………… .
(b) The number of times a body vibrates in one second is called its …………… .
(c) The pitch of a sound depends on its …………… .
(d) Sound can travel in …………… .
(e) We can hear sounds of frequency in the range of …………… .
(f) Sound requires a …………… for propagation.
(g) Sound travels faster in …………… than in liquids.
(h) The sound heard after reflection is …………… .
(i) …………… produces sensation in ears.
Write true or false for each statement:
(a) Sound can travel in vacuum.
(b) Sound is a form of energy.
(c) Sound can only be produced by vibrating bodies.
(d) Larger is the amplitude, feeble is the sound.
(e) The frequency is measured in hertz.
(f) Loudness depends on frequency.
(g) Waveforms of two different stringed instruments can be the same.
(h) Female voice is shriller than the male voice.
(i) A ticking clock sound is heard late when heard through a metal.
(j) Sound waves with frequencies lower than 20 Hz are called ultrasonic sound and sound waves with frequencies above 20,000 Hz are called infrasonic sound.