Jamb Physics 2000 Past Questions and Answers

Question 36:

• JAMB 2000

Light of energy 5eV falls on a metal of work function 3eV and electrons are liberated. The stopping potential is

A. 1.7V
B. 2.0V
C. 8.0V
D. 15.0V

Question 37:

• JAMB 2000

The velocity y of a particle in a time t is given by the equation
y = 10 + 2t²
Find the instantaneous acceleration after 5 seconds

A. 60 ms^-2
B. 20 ms^-2
C. 15 ms^-2
D. 10 ms^-2

Question 38:

• JAMB 2000

A simple pendulum has a period of 17.0s. When the length is shorten by 1.5m, its period is 8.5s. Calculate the original length of the pendulum

A. 4.0 m
B. 3.0 m
C. 2.0 m
D. 1.5 m

Question 39:

• JAMB 2000

A sonometer wire is vibrating at frequency f_o. If the tension in the wire is doubted while the length and the mass per unit length are kept constant, the new frequency of vibration is

A. ^f_o/₂
B. 2f_o
C. ^f_o/_√2
D. F_o√2

Question 40:

• JAMB 2000

A travelling wave moving from left to right has an amplitude of 0.15m, a frequency of 550Hz and a wavelength of 0.01m. The equation describing the wave is

A. Y = 0.15 sin 200Ï€(x - 5.5t)
B. Y = 0.15 sin π(0.01x - 5.5t)
C. Y = 0.15 sin 5.5Ï€(x - 200t)
D. Y = 0.15 sin π(550x - 0.01t)