Amplitude, Frequency and Time Period

Q.

What is the relation between 'time-period' and 'frequency' of an oscillating body?

Q.

Question 5
A pendulum oscillates 40 times in 4 seconds. Find its time period and frequency.

Q.

What is meant by frequency?

Q.

A person has a hearing range from $20Hz$ to $20kHz$. What are the typical wavelengths of sound waves in air corresponding to these two frequencies? Take the speed of sound in air as $344\frac{m}{s}$.

Q.

What is the relationship between frequency and time period?

Q.

Define Amplitude. [1 MARK]

Q.

Two periodic waves of intensities $I_1$ and $I_2$ pass through a region at the same time in the same direction. The sum of the maximum and minimum intensities is

1. $I_1+I_2$

2. ${\left(\sqrt{I_1}+\sqrt{I_2}\right)}^2$

3. ${\left(\sqrt{I_1}-\sqrt{I_2}\right)}^2$

4. $2\left(I{}_1+I_2\right)$

Q.

Define the following terms :

(a) Amplitude

(b) Frequency

(c) Time period.

Q.

What is the amplitude of oscillation?

Q.

What are the characteristics of sound waves?

Q.

State whether the following statements are true or false:

(a) Sound cannot travel in vacuum.

(b) The number of oscillations per second of a vibrating object is called its time-period.

(c) If the amplitude of vibrations is large, sound is feeble.

(d) The lower the frequency of vibration, the higher is the pitch.

(e) If the amplitude of vibrations is doubled, the loudness of sound also gets doubled.

(f) When the amplitude of vibrations is halved, the loudness of sound becomes one-fourth.

(g) Unwanted or unpleasant sound is termed as music.

(h) Noise pollution may cause partial hearing impairment.

Q.

Write five different sounds which you hear in a day?

Q. How does pitch of a sound vary with frequency?

Q.

As the time period of a wave increases, it's frequency decreases.Why?

Q.

Name three characteristics which are used to describe oscillations (or vibrations).

Q.

What name is given to the maximum displacement of a vibrating body from its central position ?

Q.

A wave of frequency $512Hz$ propagates with a speed of $340m{s}^{-1}$. Calculate the wavelength of the wave.

Q.

A simple pendulum takes $32$ s to complete $20$ oscillations. What is the time period of the pendulum?

Q.

If a pendulum has a time period of 3 seconds then it's frequency is

A.3 Hz

B. 0.5 Hz

C. 3 s

D. 0.33 Hz

Q. The distance between two consecutive compressions or rarefactions in a longitudinal sound wave is called the ______ of sound.

1. wavelength
2. pitch
3. loudness
4. time period

Q. Sound consisting of a single frequency is called a .

1. note
2. tone
3. pitch

Q.

Fill in the following blanks with suitable words:

(a) Sounds are produced by ___objects.

(b) The human voice box is called___

(c) Sound cannot travel in___

(d) A set of three ___tiny in the middle part of ear passes on sound vibrations from the eardrum to the liquid in cochlea.

(e) The unit of frequency is___

(f) The timet taken by an object to complete one oscillation is called ___

(g) The shrillness of a sound is determined by the___ of vibration.

(h) Unpleasant sound is called___

(i) Sound which is pleasing to the era is called___ sound

(j) A person having partial hearing loss can hear properly by wearing a device called hearing___ on the ear.

Q.

Define the frequency of vibration.

Q.

Question 4 (c)
Fill in the blank with a suitable word.
The unit of frequency is _________.

Q.

A tennis coach paces back and forth along the sideline $10$ times in $2$ minutes. The frequency of her pacing is …. $Hz$.

1. $5.0$

2. $0.20$

3. $0.12$

4. $0.083$

Q.

Explain the reason we get hiccups?

Q. Wavelength is the distance between two consecutive crests of the wave.

1. True
2. False

Q.

Obtain relationship between the time period and frequency.

Q. is the number of waves passing through a point in a unit time.

1. Time period
2. Amplitude
3. Wavelength
4. Frequency

Q.

If 125 oscillations are produced in 5 seconds, what is the frequency in hertz ?