Answered

*WORKSHEET 6
Natural Phenomena
1. Tick() the correct option:
Name:krishna
Class:8
Roll No.:19
Sec:A
1. Lightning occurs because of:
(a) rain
(b) electric discharge
(c) wind
2. The air in the path of lightning goes upto a temperature of about:
(a) 300°C
(b) 3000°C
3. The seismic waves originate from the:
(a) focus
(b) epicentre
(c) 30000°C
(c) core
(c) reflection
4. The splitting of white light into its seven colours is called:
(a) refraction
(b) dispersion
5. If light-falls perpendicular to a plane mirror. What will be its angle of reflection?
(a) 45°
(b) 0°
(c) 90°
​

Answer :

s11010864

Answer:

the correct answers are:

1. (b) electric discharge

2. (b) 3000°C

3. (a) focus

4. (b) dispersion

5. (b) 0°

Explanation:

1. Lightning is a massive electrostatic discharge that occurs during thunderstorms.

2. The temperature of the air in the path of lightning can reach up to 3000°C, which is five times hotter than the surface of the sun.

3. Seismic waves originate from the focus, which is the point where an earthquake occurs.

4. The splitting of white light into its seven colors is called dispersion, which occurs due to the different wavelengths of light being refracted at slightly different angles.

5. When light falls perpendicular to a plane mirror, the angle of reflection is 0°, meaning the light is reflected back along the same path

Electric discharge

Explanation: when negative charge and positive charge in rease or decrease

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