The photo-electric effect occurs only when the incident light has more than a certain critical____________?

Related Mcqs:

High resistivity materials are used in_____________?

A. precision instruments B. heating elements C. motor starters D. incandescent lamps E. all of the above...

At transition temperature the value of critical field is____________?

A. zero B. negative real value C. positive real value D. complex value...

Thermonic emission occurs in______________?

A. vacuum tubes B. copper conductors C. ferrite cores D. transistors...

Carbon rods are used in wet and dry cells because_____________?

A. carbon rod serves as conductor B. carbon can resist the attack of battery acid C. both (A) and (B) D. either (A) or (B)...

Due to which of the following reasons copper and aluminium are not used for heating elements ?

A. Both have great tendency for oxidation B. Both have low melting point C. Very large length of wires will be required D. All of the above...