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 a compound microscope, if the objective produces an image Io and the eye piece produces an image Ie, then
|
(a) Io is virtual but Ie is real |
(b) Io is real but Ie is virtual |
|
(c) Io and Ie are both real |
(d) Io and Ie are both virtual |
The masses of neutron and proton are 1.0087 a.m.u. and 1.0073 a.m.u. respectively. If the neutrons and protons combine to form a helium nucleus (alpha particles) of mass 4.0015 a.m.u. The binding energy of the helium nucleus will be (1 a.m.u.= 931 MeV)
|
(a) 28.4 MeV |
(b) 20.8 MeV |
(c) 27.3 MeV |
(d) 14.2 MeV |
The wiring of a house has resistance 6Ω A 100 W bulb is glowing. If a geyser of 1000 W is switched on, the change in potential drop across the bulb is nearly
|
(a) Nil |
(b) 23 V |
(c) 32 V |
(d) 12 V |
A straight conductor carries a current of 5A. An electron travelling with a speed of 5
parallel to the wire at a distance of 0.1m from the conductor, experiences a force of
|
(a) 8 |
(b) 3.2 |
(c) 8 |
(d) 1.6 |
The current flowing in two coaxial coils in the same direction. On increasing the distance between the two, the electric current will
|
(a) Increase |
(b) Decrease |
|
(c) Remain unchanged |
(d) The information is incomplete |