Spectrum is a group of.......

• Wavelengths

• Frequencies

• Both wavelength and frequency

• None of the above

What is the relationship between wavelength and frequency?

• Inversely proportional

• Directly proportional

• Same

• We cannot say

...... is the Plank's equation.

• C = nƛ

• E = hv

• E = mc²

• None of the above

The value of Plank's constant in S.I. system is......

• 6.6256 x 10^-34 JS

• 6.6256 x 10^-27 JS

• 6.6256 x 10^-31 JS

• 6.6256 x 10^-37 JS

The value of Plank's constant in C.G.S. system is......

• 6.6256 x 10^-34 erg S

• 6.6256 x 10^-31 erg S

• 6.6256 x 10^-27 erg S

• 6.6256 x 10^-30 erg s

As long as electrons revolve in a ...... orbit, its energy be neither lost nor be gained.

• valency

• stationary

• core

• none of the above

Light is a ...... wave.

• Transverse

• Longitudinal

• Electromagnetic

• Electrical

The speed of light in vacuum is......

• 3 x 10⁸ m/s

• 2 x 10⁸ m/s

• 3 x 10⁸ cm/s

• 3 x 10⁸ Km/s

Sodium vapor emits the light in ...... colour

• red

• orange

• green

• yellow

Line spectrum is also known as........

• Discrete spectrum

• Continuous spectrum

• Both discrete and continuous spectra

• None of the above