When a wave travels from one medium to another, the quantity which will not change is its:
- AAmplitude
- BVelocity
- CFrequency
- DIntensity
When a wave travels from one medium to another, the quantity which will not change is its:
Explanation:
When a wave travels from one medium to another, the amplitude, wavelength, velocity and intensity change but frequency does not change.
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In the circuit shown in the adjoining figure, the current between B and D is zero, the unknown resistance is of
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(a) 4 Ω |
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(b) 2 Ω |
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(c) 3 Ω |
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(d) em.f. of a cell is required to find the value of X |
A thin lens made of glass of refractive index m = 1.5 has a focal length equal to 12 cm in air. It is now immersed in water Its new focal length is
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(a) 48 cm |
(b) 36 cm |
(c) 24 cm |
(d) 12 cm |
A nuclear bomb exploded 200 km above the surface of moon. The sound of explosion on the moon
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(a) Will heard before the explosion is seen |
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(b) Will be heard at the same time |
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(c) Will be heard after explosion |
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(d) Will not heard at all |