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प्रश्न
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उत्तर
Frequency of vibration of a stretched string can be increased by:
1. By increasing the tension in the string.
2. By decreasing the length of the string.
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संबंधित प्रश्न
For which colour of white light, is the refractive index of a transparent medium the most?
A light ray in passing from water to a medium
(a) speeds up
(b) slows down. In each case, give one example of the medium.
Fill in the blanks to complete the following sentence
When light travels from a denser to a rarer medium, its speed ……………….
A Water pond appears to be 2.7 m deep. If the refractive index of water is 4/3, find the actual depth of the pond.
A ray of light passes from air to water. In fig. 39, which of the ray A, B, C and D is the correct refracted ray?
Fig. shows a ray of white light that passes through a prism and produces a spectrum.
(a) Name the phenomenon that is taking place.
(b) What colour would you see at X and Y?
(c) What radiation would you detect above X and below Y?
What is the refractive index of water
Complete the ray diagram showing its emergence into the air after passing through the prism.
Consider these indices of refraction: glass: 1.52; air: 1.0003; water: 1.333. Based on the refractive indices of three materials, arrange the speed of light through them in decreasing order.
