Velocity of light in glass in `2 xx 10^8 m s^(-1)` and that in air is `3 xx 10^8 m s^(-1)` .By how much would an ink dot appear to be raised,when covered by a glass plate 6.0 cm thick?

Velocity of light in a liquid is 1.5 xx 10^8 ms^(-1) and in air,it is 3xx10^8 m s^(-1) .If a ray of light passes from this liquid to air ,calculate the value of critical angle.

The velocity of electromagnetic waves in free space is 3 xx 10^8 m s^(-1) .The frequency of a radio wave of wave length 150 m is

The refractive index of glass is 1.5 and that of water is 1.3.If the speed of light in water is 2.25 xx 10^8 m s^(-1) ,what is the speed of light in glass?

A semiconductor has electron concentration of 8 xx 10^8 m^(-3) . and hole concentration 4xx10^(10)m^(-3) .Is this semiconductor p-type or n-type?

The rate constant for the first order reaction is 60s^(-1) . How much time will it take to reduce the concentration to reactant to 1/10 th of initial value ?

The number density of electron in copper is 8.5 xx10^(28)m^(-3) . Find the current flowing through a copper wire of length 20 cm, area of cross section 1 mm square,when connected to a battery of 3 V. Given the electron mobility = 4.5xx10^(-6)m^(2)V^(-1) s^(-1) and electron charge = 1.6 xx 10^(-19)C.

Calculate the de-Broglie wavelength for electron moving with speed of 6 xx 10^5 m s^(-1) .

A semiconductor has electron mobility as 2.2 xx 10^4 cm^2V^-1S^-1 andhole mobility as 1.5 xx 10^2 cm^2 V^-1S^-1 . If the electron concentration in this semiconductor is 40 xx 10^12 cm^-3 and hole concentration as 7 xx 10^14 cm^-3 . Find the type of semiconductor and its conductivity.