The yellow colour has a greater luminous efficiency as compared to the other colours. Can we increase the illuminating power of a white light source by putting a yellow plastic paper around this source ?

When a compact disc is illuminated by a source of white light, coloured lines are observed. This is due to

When a compact disc is illuminated by a source of white light, coloured lines are observed. This is due to

When you subtract green light from the white light, you get yellow colour

What is effect on the interference fringes in a Young's double slit experiment due to each of the following operations : (a) the screen is moved away from the plane of the slits, (b) the monochromatic source is replaced by another monochromatic source of shorter wavelength, (c ) the separation between the two slits is increased, (d) the source slit is moved closer to the double slit plane, (e) the width of the source slit is increased. (f) the width of two slits are increased, (g) the monochromatic source is replaced by a source of white light ? (In each operation, take all parameters, other than the one specified, to remain unchanged) NCERT Solved Example

In Summer Sqash, the fruit colour can be white, yellow and green. The appearance of white colour is due to a dominant gene W. The latter is

A bag has 4 red balls and 2 yellow balls. (The balls are identical in all respects other than colour). A ball is drawn from the bag without looking into the bag. What is probability of getting a red ball? Is it more or less than getting a yellow ball?

The metallic ions (the cations) can be identify by performing flame test which is describe below. "Make a paste of the given salt in concentrated hydrochloric acid. Load the paste on a clean platinum wire and introduce it in a non-luminous bunsen burner flame. Note the colour of the flame imparted by the flame. Tabulate your answer in the formate given below. The salt x imparts golden yellow flame. The salt y imparts lilac flame and the salt z imparts bright red flame.

You are given four sources of light each one providing a light of a single color-red, blue, green and yellow. Suppose the angle of refraction for a beam of yellow light corresponding to a particular angle of incidence at the interface of two media is 90^@ . Which of the following statements is correct it the source of yellow light is replaced with that of other lights without changing the angle of incidence ?

A metal foil is at a certain distance from an isotropic point source that emits energy at the rate P. Let us assume the classical physics to be applicable. The incident light energy will be absorbed continuously and smoothly. The electrons present in the foil soak up the energy incident on them. For simplicity , we can assume that the energy incident on a circular path of the foil with radius 5xx10^(-11) m (about that of a typical atom ) is absorbed by a single electron. The electron absorbs sufficient energy to break through the binding forces and comes out from the foil. By knowing the work function, we can calculate the time taken by an electron to come out i.e., we can find out the time taken by photoelectric emission to start. As you will see in the following questions, the time decay comes out to be large, which is not practically observed. The time lag is very small. Apparently, the electron does not have to soak up energy . It absorbs energy all at once in a single photon electron interaction. If power of the source P is 1.5 W and distance of the foil from the source is 3.5 m, the energy received by an electron per second is

You are given four sources of light each one providing a light of a single colour-red, blue,green and yellow. Suppose the angle of refraction for a beam of yellow light corresponding to a particular angle of incidence at the interface of two media is 90^@ . Which of the folowing statements is correct it the source of yellow light is replaced with that of other lights without changing the angle of incidence ?