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Ncert solutions

CHAPTERS

1. Crop Production and Management

2. Microorganisms: Friend and Foe

3. Synthetic Fibres and Plastic

4. Materials: Metals and Non-Metals

7. Conservation of Plants and Animals

8. Cell — Structure and Functions

10. Reaching the Age of Adolescence

14. Chemical Effects and Electric Current

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

The number of oscillations per second of the vibrating body is known as the frequency of oscillation.

Frequency = Total number of oscillations

Total time taken

= 50/5

= 10 Hz

Time period is the time taken to complete one oscillation. It is also the inverse of frequency.

Time period = 1/ Oscillating frequency

= 1/10

= 0.1 s

∴ frequency = 10 Hz

Time period = 0.1 s

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

The number of oscillations per second of the vibrating body is known as the frequency of oscillation.

Frequency = Total number of oscillations

Total time taken

= 50/5

= 10 Hz

Time period is the time taken to complete one oscillation. It is also the inverse of frequency.

Time period = 1/ Oscillating frequency

= 1/10

= 0.1 s

∴ frequency = 10 Hz

Time period = 0.1 s

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