Dual Nature of Matter and Radiation-Photoelectric Effect (KVPY (Kishore Vaigyanik Protsahan Yojana) Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics): Questions 9 - 9 of 9

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Question number: 9

» Dual Nature of Matter and Radiation » Photoelectric Effect

MCQ▾

Question

When ultraviolet radiation of a certain frequency falls on a potassium target, the photoelectrons released can be stopped completely by a retarding potential of 0.9 V. If the frequency of the radiation is increased by 15%, this stopping potential rises to 1.2 V. The work function of potassium is –

Choices

Choice (4) Response

a.

2.0 eV

b.

1.5 eV

c.

2.8 eV

d.

1.1 eV

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