Frequency below which no electrons are emitted from metal surface is

Related MCQs

• If a billion electrons enter a point in 1 s, then number of electrons leaving that point in 1 s are
• Radiations emitted by radioactive substances is
• Gamma radiation is emitted in order to
• If frequency of modulated wave is less than frequency of carrier wave, then input signal is
• A train with a whistle that emits a note of frequency 800 Hz is approaching an observer at speed of 60 m s-1, the frequency of note heard by observer is {{}}
• Electrons which are free to move around are also called
• Process in which α and β rays pass close to atoms and knock electrons out is called
• Number of conduction electrons per unit volume is
• Actual velocity of electrons between collisions is
• If fast moving electrons rapidly decelerate, then rays produced are