-
$\lambda'>\lambda$
-
$\lambda'=\lambda$
-
$\lambda'<\lambda$
- Nothing can be said about the relation of $\lambda$ and $\lambda'.$
$\lambda'>\lambda$
$\lambda'=\lambda$
$\lambda'<\lambda$
$\lambda'<\lambda$
Explanation:

As $\text{v}=\sqrt{\frac{\text{f}}{\mu}}$
A wave pulse travels faster in a thinner string. The wavelength of the transmitted wave is equal to the wavelength of the Incident wave because the frequency remains constant.
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A particle of mass m and charge q moves with a constant velocity v along the positive x direction. It enters a region containing a uniform magnetic field B directed along the negative z direction, extending from x = a to x = b. The minimum value of v required so that the particle can just enter the region x > b is
|
(a) qb B/m |
(b) q(b – a) B/m |
(c) qaB/m |
(d) q(b + a)B/2m |
Assertion : If a point charge q is placed in front of an infinite grounded conducting plane surface, the point charge will experience a force.
Reason : This force is due to the induced charge on the conducting surface which is at zero potential.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
Carbon dating is best suited for determining the age of fossils if their age in years is of the order of
|
(a) |
(b) |
(c) |
(d) |
Huygen wave theory allows us to know
|
(a) The wavelength of the wave |
(b) The velocity of the wave |
|
(c) The amplitude of the wave |
(d) The propagation of wave fronts |
The point representing the cut off grid voltage on the mutual characteristic of triode is
| (a) S | (b) R |
(c) O |
(d) P |