Hydrogen atom is excited from ground state to another state with principal quantum number equal to 4. Then the number of spectral lines in the emission spectra will be
Number of spectral lines from a state n to ground state is
n(n-1)/2 = 6
If the velocity of a body is doubled its momentum ________________.
A body of mass 8 kg is moving with a velocity of 4 m/s, find its momentum.
Ozone at the higher level of the atmosphere is a product of ______ acting on oxygen molecules.
'Torr' is a unit of _______.
What is the velocity of sound in air?
The power of a lens is —2.5 D. The type of lens and its focal length are respectively:
Which one of the following is the unit of force?
Which of the following are Mechanical waves?
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