A ray of light is incident on a medium with angle of incidence i and refracted into a second medium with angle of refreaction r. The graph of sin i vs sin r is shown in the figures. Then the velocity of light in the first medium is n times the velocity of light in the second medium. The value of n should be.
Equation of sound wave in air is given by . Find the speed of sound in air.
3-Methyl-pent-2-ene on reaction with HBr in presence of peroxide forms an addition product. The number of possible stereoisomers for the product is :
Two
Four
Six
Zero
pK_{a} of a weak acid (HA) and pK_{b} of a weak base (BOH) are 3.2 and 3.4, respectively. The pH of their salt (AB) solution is :
7.0
1.0
7.2
6.9
A physical quantity P is described by the relation
P= a^{1/2} b^{2} c^{3} d^{-4}
If the relative errors in the measurement of a, b, c and d respectively, are 2%, 1%, 3% and 5%,
then the relative error in P will be :
8%
12%
32%
25%
A standing wave is formed by the superposition of two waves travelling in opposite directions. The transverse displacement is given by
What is the speed of the travelling wave moving in the positive x direction ?
(x and t are in meter and second, respectively.)
160 m/s
90 m/s
180 m/s
120 m/s