The equation of a wave is y = 5 sin ; where x is in cm and t is in second. The maximum velocity of the wave will be
1 ms-1
2 ms-1
1.5 ms-1
1.25 ms-1
Two vibrating strings of the same material but lengths L and 2L have radii 2r and r respectively. They are stretched under the same tension. Both the strings vibrate in their fundamental modes, the one of length L with frequency and the other with frequency The ratio is
2
4
8
1
1 mole of an ideal gas at an initial temperature of T K does 6R joule of work adiabatically. If the ratio of specific heats of this gas at constant pressure and at constant volume is 5/3, then final temperature of the gas will be
( T - 4 ) K
( T + 4 ) K
( T - 2.4 ) K
( T + 2.4 ) K
Consider a compound slab consisting of two different materials having equal lengths, thicknesses and thermal conductivities K and 2K respectively. The equivalent thermal conductivity of the slab is
3 K
A black body has a wavelength of A at temperature 2000 K. Its corresponding wavelength at temperature 3000 K will be
If Young's double slit experiment is performed i water instead of air, then
no fringes would be seen
fringe width would decrease
fringe width would increase
fringe width would remain unchanged
B.
fringe width would decrease
Fridge width
β =
⇒ β ∝ λ
If the experiment is performed in water, wavelength A decreases, so, fringe width also decreases.
Figure shows three spherical and equipotential surfaces A, B and C round a point charge q. The potential difference If t1 and t2 be the distances between them, then
t1 = t2
t1 > t2
t1 < t2
t1 ≤ t2
Three capacitors of capacitances 1 µF, 2µF and 4μF are connected first in a series combination and then in a parallel combination. The ratio their equivalent capacitances will be
2 : 49
49 : 2
4 : 49
49 : 4
At room temperature, copper has free electron density of 8.4 x 1028 m-3, The electron drift velocity in a copper conductor of cross-section area of 10-6 m2 and carrying a current of 5.4 A will be
4 ms-1
0.4 ms-1
4 ms-1
0.4 mm s-1