Define standard metre in terms of the wavelength of light.

Define standard metre in terms of velocity of light.

Assertion : Now a days a standard metre is defined as in terms of the wavelength of light. Reason : Light has no relation with length.

What is the accuracy of the metre defined in terms of wavelength of light radiation ?

Electrons are emitted from the cathode of a photocell of negligible work function, when photons of wavelength lamda are incident on it. Derive the expression for the de Broglie wavelength of the electrons emitted in terms of the wavelength of the incident light

What is the wavelength of violet light?

The wavelength of visible light is