Dual Nature of Radiation MCQ with Answers

Dual Nature of Radiation MCQ with Answers

46) If a potential of?10⁷?volts is applied across the electrodes of a CRT, then speed attained by the electrons is approximately

Answer is:

1.9??10⁹ms^?1

Explanation:

If a potential of?10⁷?volts is applied across the electrodes of a CRT, then speed attained by the electrons is approximately? 1.9??10⁹ms^?1

47) Energy of a photon of green light of wavelength 5500 is

Answer is:

2.26 eV

Explanation:

use W=hV_o and E = hc/(/lambda)

48) Wavelength associated with a photon having energy 4.14eV is

Answer is:

4000 A^o

Explanation:

use W=hV_o and E = hc/(/lambda)

49) If the work function of a material is 2eV, then minimum frequency of light required to emit photo-electrons is

Answer is:

4.8??10¹⁴Hz

Explanation:

use W=hV_o and E = hc/(/lambda)

50) If the threshold wavelength of radiations required to eject a photoelectron from a metal surface is 6??10^?7?m, then work function of the metal is

Answer is:

3.3??10^?19?J

Explanation:

use W=hV_o and E = hc/(/lambda)

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