Physics MSc

Q: The Threshold frequncy of sodium is 6 × 10⁸ MHz The cut-off wavelength for this metal will be

(a) :  500 m
(b) :  500 nm
(c) :  500 km
(d) :  500 cm
(e) :  None of these
Answer:  500 nm

Q: To make an LED, it is impracticable to use

(a) :  Silicon
(b) :  Gallium arsenide
(c) :  Gallium arsenide phosphide
(d) :  Iron
(e) :  Both B and C
Answer:  Both B and C

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