The brightness producing capacity of a source: 1. Does not depend… - Vidyadip

Question

The brightness producing capacity of a source:

Does not depend on its power.
Does not depend on the wavelength emitted.
Depends on its power.
Depends on the wavelength emitted.

✓

Answer

Depends on its power.
Depends on the wavelength emitted.

Explanation:

Brightness depends upon how our eyes perceive light. Our eyes perceive yellow colour the most, so brightness depends upon the colour of the source. Now, colour is related to the wavelength of the source; so, brightness depends upon the wavelength as well.

Our eyes detect brightness by the amount of photons actually reaching our retinas. Again, the number of photons depends upon the power of the source. So, brightness depends upon the power of the source too.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "1 Marks Question" from Photometry→Photometry — all question types→Physics STD 11 Science question papers→Rajasthan Board STD 11 Science question papers→Rajasthan Board question paper generator→

Similar questions

What is the smallest positive phase constant which is equivalent to $7.5\pi?$

What is the condition to be satisfied by a mathematical relation between time and displacement to describe a periodic motion?

Can a hydrogen atom emit characteristic X-rays?

If x = a + bt + ct², where x is in metres andt is second, what is the dimensional formula of c?

You can create waves in any pond by throughing any stone then source of energy of waves.

The density of water is 1000 $kg m ^{-3}$. The density of water vapour at $100^{\circ} C$ and $1 atm$ pressure is $0.6 kg m ^{-3}$. The volume of a molecule multiplied by the total number gives , what is called, molecular volume. Estimate the ratio (or fraction) of the molecular volume to the total volume occupied by the water vapour under the above conditions of temperature and pressure.

If the velocity of the center of mass of the particle system is zero, then will the velocities of its various particles necessarily be zero?

Consider the situation described in the previous problem. Suppose the current i enters the loop at the point A and leaves it at the point B. Find the magnetic field at the centre of the loop.

The velocity of a particle is towards west at an instant. Its acceleration is not towards west, not towards east, not towards north and not towards south. Give an example of this type of motion.

Suppose two trains A and B are moving with uniform velocities along parallel tracks in the same direction and the velocities of A and B be 60km/h in East and 65km/h in East. Find the relative velocity of B w.r.t. A.