The mercury and sodium street lamps light up because of –

Related MCQs

• On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because
• Mercury is commonly used as a thermometric fluid rather than water because
• When a strong beam of light is passed through a colloidal solution, the light will –
• A spherical ball made of steel when dropped in mercury container will –
• What is the range of mercury thermometer?
• Stars appear twinkling because of ______ of light.
• Red light is used for signals because it has –
• Sound and light waves both               .
• A light year is a measure of :
• Which one of the following instruments is used to study dispersion of light?