NCERT - 8 - Science :: Sound

From evidyaloka
Jump to: navigation, search

Go To: NCERT-Science-Grade 8


Objective: To teach the students about sound and how sound is produced

Subtopics to be covered:

  1. How sound travel through different mediums
  2. How do we hear and characteristic of sound
  3. Sound pollution, effects and prevention of sound pollution

Learning Outcome:

  1. Students know about sound and difference between music and noise
  2. They know about the sound frequencies
  3. They know how do we hear and are aware of sound pollution"

[Contributor - Rini Jose] (Hindi and English)

[Contributor - Kripa S]

(Source - Bodhaguru) (Hindi - Sound requires a medium )

(Source -OLI - NSS, IITB) (Hindi - Sound)

[Contributor - Arshea Bimal, Kripa S]

1. (Straw flute)

2. Make a list of sounds you hear in your surroundings.

3. Take a rubber band. Put it around the longer side of a pencil box. Insert two pencils between the box and the stretched rubber. Now, pluck the rubber band somewhere in the middle. Do you hear any sound? Does the band vibrate?

3. Take a metal dish. Pour water in it. Strike it at its edge by a spoon. Do you hear a sound? Again strike the plate and then touch it. Can you feel the dish vibrating? Strike the dish again. Look at the surface of water. Do you see any waves there? Now hold the dish. What change do you observe on the surface of water? Can you explain the change? Is there a hint to connect sound with the vibrations of a body?

4. (roaring bottle)

[Contributor - Fathima Nazar]

Term Transliterated Term Translated Term
AMPLITUDE आम्प्लीट्यूड आयाम
AUDIBLE ऑडिबल श्रव्य
EARDRUM इयर ड्रम कर्ण पटह
HERTZ (Hz) हेर्त्ज़ हर्ट्ज
LARYNX लरिंग्स कंठनली
LOUDNESS लाउडनेस प्रबलता
NOISE नॉइस शोर
OSCILLATION ऑसिलेशन दोलन
PITCH पिच तारत्व
SHRILLNESS श्रिलनेस तीक्ष्णता
TIME PERIOD टाइम पीरियड आवर्तकाल
VIBRATION वाइब्रेशन कंपन
WIND PIPE विंड पाइप श्वास नली
(0 votes)

Add your comment
evidyaloka welcomes all comments. If you do not want to be anonymous, register or log in. It is free.