Time Period and Frequency

Q.

Define Time Period and give its units.

Q.

What is a second's pendulum?what is its length?

Q. The time period of oscillation of the simple pendulum depends upon the length of string.

1. True
2. False

Q. Sound waves with frequency less than$20Hz$ is _________.

1. infrasonic
2. ultrasonic
3. supersonic
4. audible

Q. The number of oscillations per second is called its time period.

1. True
2. False

Q. True or false-
The time period of a given pendulum is not constant.

Q.

What does it mean if we say that a turning fork has a frequency of 256Hz?

Q. The sound from a honey bee is produced when it vibrates its wings at an average rate of 400 vibrations per second. What is the time period of the vibration in milliseconds?

1. 2.5
2. 3.5
3. 4.5
4. 5.5

Q. The time period of a sound wave is $0.020s$. What is its frequency?

1. $50Hz$
2. $5Hz$
3. $100Hz$
4. $20Hz$

Q. Question 8
1 hertz is equal to

(a) 1 vibration per minute
(b) 10 vibrations per minute
(c) 60 vibrations per minute
(d) 600 vibrations per minute

Q. A boy is running to and fro between points A and B with a constant speed of 20 m/s. If the points A and B are 5 m apart, find the frequency of to and fro motion of the boy.

1. 3 Hz
2. 5 Hz
3. 11 Hz
4. 2 Hz

Q.

A simple pendulum takes 20 seconds to complete 12 oscillations. Calculate its time period. What type of motion does the pendulum undergo? [3 MARKS]

Q. The time period of a sound wave is $0.020s$. What is the frequency of vibration?

1. $20Hz$
2. $100Hz$
3. $50Hz$
4. $40Hz$

Q.

The time period T of a sound wave is 0.020 seconds. What is the frequency f of the vibration?

1. Loudness

2. Amplitude

3. Pitch

4. None of these

Q.

Frequency is measured in ___________ $(decibels/hertz)$.

Q. Match the following range of frequencies with their sounds.

1. Infrasound
2. Audible sound
3. Ultrasound

Q.

A mosquito is making sound with its wings at an average rate of $500$ vibrations per $10$ seconds. The frequency of vibrations is

Q.

What is the term used for the sound with a frequency below 20 Hz?

Q.

Question 3 (b)
State whether the following statement is true or false.
The number of oscillations per second of a vibrating object is called its time period.

Q.

The frequency of a wave is 5 Hz. The type of wave refers to

1. ultrasonic

2. microwave

3. infrasonic

4. radio wave

Q.

The number of oscillations or vibrations per second is called ___ of the oscillations.

Q.

A bicycle wheel spins 25 times in 5 seconds. Calculate the period and frequency of the wheel.

Q.

Which of the following gives the most accurate measurement of time?

1. water clock

2. atomic clock

3. pendulum clock

4. quartz clock

Q.

The piston in a petrol engine goes up and down 3000 times per minute. For this engine, calculate the frequency and period of the piston.

Q. The time taken by a simple pendulum to complete one oscillation, is called

1. distance
2. average speed
3. odometer
4. time period

Q. ___________ is inversely related to frequency.

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

Q.

What is echocardiography?

Q. In the figure given below:

The pendulum is said to complete one oscillation when it completes which one of the following paths?

1. O – B – O
2. O – B – O – A – O
3. O – A – O
4. O – B – O – A

Q. The time taken by a simple pendulum to complete one oscillation, is called

1. odometer
2. average speed
3. time period
4. distance

Q. ntA simple pendulum of a certain clock has time period 2.04sec. How fast or slow does the clock run during 12 hours?n nt1) 11.4 min slown nt2) 12.4 min slown nt3) 14.4 min slown nt4) 15.2 min slown