Colour
Trending Questions
Q. A piece of plane glass is placed on a word with letters of different colours. The letter which appear minimum raised. 1.red 2.green 3.yellow. 4.violet
Q. A plane glass plate is kept over various colored letters. The letter which appears least raised is
- blue
- Violet
- Green
- red
Q. 44. piece of plane glass is placed on a word with letters of different colours. The letter which appear minimum raised. 1.red 2.green 3.yellow.
Q. A 100 eV electron collides with a stationary helium ion (He+) in its ground state and excites to a higher level. After the collision, He+ ion emits two photons in succession with wavelengths 1085˚A and 304˚A. Find the principal quantum number of the excited state. Also, calculate the energy of the electron after the collision. Given h=6.63×10−34J s.
Q. Explain the formation of Ionic bond in NaCl.
Q. A helium ion and a hydrogen ion are accelerated from rest through a potential difference of V to velocities vHe and vH respectively. If helium has lost one electron, the ratio of vHe/vH is:
- 1/4
- 1/2
- 1
- √2
Q. Assertion :The circle of smallest radius passing through two given points A & B must be of radius 12AB. Reason: A straight line is a shortest distance between two points.
- Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
- Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
- Assertion is correct but Reason is incorrect
- Both Assertion and Reason are incorrect
Q. The electron present in excited state of He⊕ ion shows separation on collision with an electron having 2.5 eV energy. What will be the minimum value of n for this electrons of He⊕ ion ?
- 4
- 5
- 6
- 3
Q. Draw a neat labelled diagram for Ferry's perfectly black body.
Q. why is the colour of clear sky blue