Explanation:
They travel at different speed in air depending on their frequency. At constant as the speed will be same irrespective of frequency. Also frequency is source dependent and doesn't controls speed.
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A solid that transmits light in visible region and has a very low melting point possesses
|
(a) Metallic bonding |
(b) Ionic bonding |
|
(c) Covalent bonding |
(d) Vander Waal’s bonding |
A cell of internal resistance 3 ohm and emf 10 volt is connected to a uniform wire of length 500 cm and resistance 3 ohm. The potential gradient in the wire is
|
(a) 30 mV/cm |
(b) 10 mV/cm |
(c) 20 mV/cm |
(d) 4 mV/cm |
Which of the following is not equal to watt
|
(a) |
(b) Amp / Volt |
(c) Amp × Volt |
(d) Joule / sec |
A thin plano-convex lens acts like a concave mirror of focal length 0.2 m when silvered from its plane surface. The refractive index of the material of the lens is 1.5. The radius of curvature of the convex surface of the lens will be
|
(a) 0.4 m |
(b) 0.2 m |
(c) 0.1 m |
(d) 0.75 m |
