Modern Physics

Q: According to special theory of relativity, mass and enegy are:

(a) :  Different entities
(b) :  Related as E = mc²
(c) :  Inter-convertible
(d) :  Similar entities
(e) :  All are true except D
Answer:  All are true except D
Explanation:  

Q: The work function has the value of 3.94 × 10¯¹⁹ J for sodium. The threshold freqeuncy of function of sodium will be

(a) :  6 × 10⁸ Hz
(b) :  6 × 10¹⁴ MHz
(c) :  Both A and B
(d) :  6 × 10⁸ MHz
(e) :  6 × 10²⁰ Hz
Answer:  6 × 10⁸ MHz
Explanation:  

Q: The radiant energy:

(a) :  Always increases with increase in wavelength
(b) :  Always decreases with decrease in wavelength
(c) :  Initially increases and then decreases
(d) :  Both A and B
(e) :  None of these
Answer:  Initially increases and then decreases
Explanation:  

Q: The idea of quantization of energy was proposed by

(a) :  Einstein
(b) :  Max. Planck
(c) :  Maxwell
(d) :  Bohr
(e) :  Rutherford
Answer:  Max. Planck
Explanation:  

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