Waec Physics 1994 Past Questions and Answers

Question 31:

• WAEC 1994

The wave function of a metal is 8.0 x \(10^{-19}\)J. Calculate the wavelength of its threshold frequency. (Speed of light in a vacuum = 3 x \(10^8ms^{-1}, Planck's constant = 6.6 \times 10^{-34}\)Js)

A. 0.8 x \(10^{-7}\)m
B. 1 x \(10^{-7}\)m
C. 2.3 x \(10^{-7}\)m
D. 3.8 x \(10^{-7}\)m
E. 12.4 x \(10^{-7}\)m

Question 32:

• WAEC 1994

A note of frequency of 2000Hz has a velocity of \(400ms^{-1}\). What is the wavelength of the note?

A. 800m
B. 200m
C. 5m
D. 2m
E. 0.2m

Question 33:

• WAEC 1994

A cell of e.m.f. 1.5V and internal resistance of 2.5Ω is connected in series with an ammeter of resistance 0.5W and a resistor of resistance of 7.0Ω. Calculate the current in the circuit.

A. 0.15A
B. 0.20A
C. 2.10A
D. 3A
E. 6.6A

Question 34:

• WAEC 1994

A ball is dropped from a height of 45m above the ground. Calculate the velocity of the ball just before it strikes the ground. (Neglect air resistance and take g as \(10ms^{-2}\)

A. 21.2\(ms^{-1}\)
B. 30\(ms^{-1}\)
C. 300\(ms^{-1}\)
D. 450\(ms^{-1}\)
E. 900\(ms^{-1}\)

Question 35:

• WAEC 1994

A body accelerates uniformly from rest at \(2ms^{-2}\). Calculate the velocity after traveling 9m

A. 36\(ms^{-1}\)
B. 18\(ms^{-1}\)
C. 6\(ms^{-1}\)
D. 4.5\(ms^{-1}\)
E. 4.24\(ms^{-1}\)