Diamonds have a high refractive index and total internal reflection occurs inside them, allowing light to reflect multiple times before escaping, creating their sparkle.
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- When you look at the front side of a polished spoon, your image is inverted, and from the back of the spoon, your image is erect. Explain why?
- Which mirror is used by girls for makeup and why?
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- Sound-NFE
- Why does sound require a medium to travel?
- What is the effect of humidity on the speed of sound?
- What is the difference between audible, infrasonic, and ultrasonic sounds?
- What is the relation between frequency and pitch of a sound?
- Why do we hear sound more clearly at night than during the day?
- Explain how sound is produced and propagated.
- Describe the characteristics of sound and their significance.
- Explain SONAR and its applications.
- What is intensity of sound? What is the range of intensity of audible sound? Differentiate between loudness and intensity of sound.
- Define intensity level. Derive the formula for its decibel scale.
- Differentiate between noise and music. Explain how noise is a nuisance.
- What is acoustics and acoustic protection? How does their study help in the construction of different structures?
- What is the audible frequency range? Explain in detail.
- What are ultrasounds? Give their uses in different fields of life.