Physics WAEC Past Questions

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426

A metal has work function of 4.375 eV Calculate its threshold frequency. (h = 6.6 x 10^-34Js; 1eV = 1.6 x 10^-19J)

A. 2.01 X 10¹⁵Hz
B. 1.06x10¹⁵Hz
C. 6.30 x 10¹⁴Hz
D. 1.60 x 10¹⁴Hz

View Answer & Discuss (8) WAEC 1999

427

The half-life of a radioactive substance is

A. its average life time
B. one-half the value of its decay constant.
C. the length of time needed by the substance to decay completely
D. the length of time during which the activity of the substance reduces by 50%.

View Answer & Discuss WAEC 1999

428

The half-life of a radioactive element is 5 Calculate its decay constant

A. 0.113s^-1
B. 0.436 s^-1
C. 0.139 s^-1
D. 0.193 s^-1.

View Answer & Discuss (9) WAEC 1999

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429

A sheet of paper is placed in the path of the following radiations: I. Alpha particles II. Beta particles III. Gamma rays. Which of the radiations will pass through the sheet of paper?

A. I only
B. II only
C. I and II only
D. II and III only

View Answer & Discuss (6) WAEC 1999

430

Which of the following are the essential parts of an atomic bomb?

A. Uranium and neutrons
B. Radium and polonium
C. Nitrogen and neutrons
D. ranium and α - particles.

View Answer & Discuss (2) WAEC 1999

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