When light is refracted from air into glass
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(a) Its wavelength and frequency both increase |
|
(b) Its wavelength increases but frequency remains unchanged |
|
(c) Its wavelength decreases but frequency remains unchanged |
|
(d) Its wavelength and frequency both decrease |
(c) Its wavelength decreases but frequency remains unchanged
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A 20 cm length of a certain solution causes right-handed rotation of 38°. A 30cm length of another solution causes left-handed rotation of 24°. The optical rotation caused by 30cm length of a mixture of the above solutions in the volume ratio 1 : 2 is
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(a) Left handed rotation of 14° |
(b) Right handed rotation of 14° |
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(c) Left handed rotation of 3° |
(d) Right handed rotation of 3° |
The magnitude of i in ampere unit is
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(a) 0.1 |
(b) 0.3 |
(c) 0.6 |
(d) None of these |
The resistivity of a wire depends on its
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(a) Length |
(b) Area of cross-section |
(c) Shape |
(d) Material |