Frequency

Q.

What are examples of low pitch sound

Q.

Write the SI unit of frequency.

Q.

Calculate the number of oscillations a simple pendulum does in 2 minutes if its time period is 0.5 seconds.

1. 120

2. 240

3. 360

4. 480

Q.

Frequency is inversely proportional to ___ .

Q.

1.what is the time period of an vibrating object

2. What is meant by the frequency of a sound wave

Q.

Define time period and frequency. How are they related to?

Q.

Frequency is measured in hertz.

1. True
2. False

Q. A wave source produces 10 crests and 10 troughs in 0.1 seconds. Find the frequency of the wave.

1. 200 Hz
2. 500 Hz
3. 100 Hz
4. 300 Hz

Q.

A sound wave has a time period of 0.5s. What is the frequency of the wave?

1. 0.5Hz

2. 2 Hz

3. 50 Hz

4. 125 Hz

Q.

What are even order harmonics?

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

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

Q.

find the time period of wave whose frequency is 500 hz

Q.

Give scientific reason:

The voice of a woman is generally shriller than that of a man.

Q. A sound wave has a time period of $0.5\text{s}$. How many times does a particle pass through a given point in one second?

1. $2$
2. $0.5$
3. $1$
4. $4$

Q.

A sound of wavelength was found to be 151 m. If its speed in a medium is 113, 250 m/s, what could be the frequency of the sound wave?

1. It increase little

2. It increases to a large extent

3. It doesn't change

4. It decreases

Q. We can distinguish a shrill sound from a flat sound by its​

Q.

What is the difference between odd and even harmonics?

Q.

what factors decide the freuency of vibration of an air column

Q. Fill in the blanks​

• The pitch of a sound depends on its

Q. The relation between frequency(f) and time period(T) is given by

1. f = T
2. f = $\frac{1}{T}$
3. T = f${}^2$
4. T = f${}^3$

Q.

The unit of frequency is______.

1. Hertz

2. metre/second

3. metre

4. second

Q. The sound from a mosquito is produced when it vibrates its wings at an average rate of 500 vibrations per second. What is the time period of the vibration?

Q. If the amplitude of a sound is tripled, what will be the effect on its loudness?

1. Increases four times
2. Decreases four times
3. Increases six times
4. Decreases six times

Q.

Frequency of a sound wave is defined as:

1. number of compressions/rarefactions per unit time

2. distance between two peaks

3. all of these

4. time between occurrence of two valleys/peaks

Q. Describe an experiment to show the production of sound having low and high pitch. [5 Marks]

Q. Name the two characteristics of sound which differentiate two sounds from each other.

Q.

The sound which is below the frequency of 20 Hz is called

___

Q.

Write down the relation between frequency and time period.

Q.

The S.I. units of frequency is ________.

Q. A listener is at rest with respect to the source of sound. A wind starts blowing along the line joining the source and the observer. Which of the following quantities do not change?
(a) Frequency
(b) Velocity of sound
(c) Wavelength
(d) Time period