Question

Q4. Answer the following questions.
1. A pendulum oscillates 40 times in 4 seconds. Find its time period of frequency.
Ans-​

Answer 1

Answer:

Ncert solutions

Grade 8ScienceNCERT Solutions - Science , Class 8SoundExerciseQuestion 5

Sound | Exercise



Question 5





CHAPTERS

1. Crop Production and Management

2. Microorganisms: Friend and Foe

3. Synthetic Fibres and Plastic

4. Materials: Metals and Non-Metals

5. Coal and Petroleum

6. Combustion and Flame

7. Conservation of Plants and Animals

8. Cell — Structure and Functions

9. Reproduction in Animals

10. Reaching the Age of Adolescence

11. Force and Pressure

12. Friction

13. Sound

14. Chemical Effects and Electric Current

15. Some Natural Phenomena

16. Light

17. Stars and the Solar System

18. Pollution of Air and Water



EXERCISES

1. Exercise

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

Solution

Transcript

Solution 5:

Time period is defined as the time required to complete one oscillation.

Frequency is defined as the number of oscillations per unit time.

Time = 4 sec.

Time Period = (Time taken) / (Number of Oscillations)

Time Period = (4/40) = 0.1 sec.

Frequency = (Number of Oscillations)/ (Time taken)Frequency = (40/4) =10Hz.

Answer 2

Answer:

10Hz

Explanation:

Time period = t / no. of oscillations in time

= 4/40

=0.1 s

so, frequency = 1/time period

= 10 Hz