The difference in speeds of a rya of light in galss and wate is ` 2.5 xx 10^(7) m//s `. If the R.I. of glass and water are `(3)/2 and (4)/3` respectively, then the velocity of light in air isA. a) `2 xx 10^(8) m//s `B. b) `2.25 xx 10^(8) m//s `C. c) `3 xx 10^(8) m//s `D. d) `2.5 xx 10^(8) m//s `

The difference in speeds of a rya of light in galss and wate is ` 2.5

1.	The difference in speeds of a rya of light in galss and wate is ` 2.5 xx 10^(7) m//s `. If the R.I. of glass and water are `(3)/2 and (4)/3` respectively, then the velocity of light in air isA. a) `2 xx 10^(8) m//s `B. b) `2.25 xx 10^(8) m//s `C. c) `3 xx 10^(8) m//s `D. d) `2.5 xx 10^(8) m//s `
Answer» Correct Answer - C `V_g=(V_(a))/(3//2)=(2)/(3)V_a, V_w=V_w=(V_a)/(4//3)=(3)/(4) V_a ` `:. (3)/(4)V_a -(2)/(3)V_a=(1)/(12)V_a=2.5 xx 10^(7)` `:. V_a=12 xx 2.5 xx 10^(7) =3 xx 10^(8) m//s `

Discussion

No Comment Found

Related InterviewSolutions

When an unpolarised light of inensity `I_0` is incident on a polarizing sheet, the intensity of the light which does not get transmittted isA. `I_0`B. ZeroC. `(1)/(4)I_0`D. `(1)/(2)I_0`
What is the shape of the wavefront in each of the following cases ? (a) light diverging from point source. (b) light emerging out of a convex lens when a point source is placed at its focus. ( c) the portion of the wavefront of light from a distant star intercepted by earth.A. Cylindrical wavefrontB. Plane wavefrontC. Converging wavefrontD. Diverging wavefront
When the same monochromatic ray of light travels through glass slab and through water, the number of waves in glass slab of thickness 6 cm is same as in water column of height 7 cm. If refractive index of glass is `1.5`, then refractive index of water isA. `1.258`B. `1.269`C. `1.286`D. `1.310`
When the same monochromatic ray of light travels through glass slab and through water, the number of waves in glass slab of thickness 6 cm is same as in water column of height 7 cm. If refractive index of glass is `1.5`, then refractive index of water isA. `1.25`B. `1.5`C. `1.33`D. `1.75`
The periodic time of rotation of a certain star is 22 days and its radius is `7 xx 10^(8)` metres . If the wavelength of light emitted by its surface be `4320 Å`, the Doppler shift will be (1 day = 86400 sec )A. 0.33ÅB. 0.33ÅC. 3.3ÅD. 33Å
The `6000Å` line emitted by a gaseous element in a star iis found to have red shift of ` 15Å`. What is the speed with which the star is receding from the earth ? `(c=3 xx 10^(8) m//s )`A. `5xx10^(5) m//s `B. `6xx10^(5) m//s `C. `7.5xx10^(5) m//s `D. `9xx10^(5) m//s `
A light is travelling from air a medium the velocity of light in a medium is reduced to to 0.75 times the velocity n air assume that angle of incidence I is very small the deviation of the ray isA. `delta=i`B. `delta=(i)/2`C. `delta=(i)/4`D. `delta=2r `
The wave number of two waves are ` 2.5 xx 10^(6)`/ metre and ` 2 xx 10^(6)`/metre. What is the difference between their wavelengths ?A. `5000Å`B. `4000Å`C. `2000Å`D. `1000Å`
A strone thrown into still water, creates a circular wave pattern moving radially outwards. If r is the distance measured from the centre of the pattern. The amplitudeof the aves varies asA. `r^(-1//2)`B. `r^(-1) `C. `r^(-2)`D. `r^(-3//2 )`
The difference in speeds of a rya of light in galss and wate is ` 2.5 xx 10^(7) m//s `. If the R.I. of glass and water are `(3)/2 and (4)/3` respectively, then the velocity of light in air isA. a) `2 xx 10^(8) m//s `B. b) `2.25 xx 10^(8) m//s `C. c) `3 xx 10^(8) m//s `D. d) `2.5 xx 10^(8) m//s `

The difference in speeds of a rya of light in galss and wate is ` 2.5 xx 10^(7) m//s `. If the R.I. of glass and water are `(3)/2 and (4)/3` respectively, then the velocity of light in air isA. a) `2 xx 10^(8) m//s `B. b) `2.25 xx 10^(8) m//s `C. c) `3 xx 10^(8) m//s `D. d) `2.5 xx 10^(8) m//s `

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment