Physics Past Questions and Answers

In a discharge tube, most of the gas is pumped out so that electricity is conducted at

A Low voltage
B Steady voltage
C High pressure
D Low pressure

Question 1522:

The ground stated energy for the hydrogen atom is 5.44 x 10^-19J . If an electron drops from zero energy to ground state, calculate the frequency of the emitted radiation.
[h = 6.6 x 10^-34 Js]

A 5.0 x 1016 Hz
B 2.0 x 1016 Hz
C 5.0 x 1015 Hz
D 2.0 x 1015 Hz
E No correct option

Question 1523:

The ground stated energy for the hydrogen atom is 5.44 x 10^-19J . If an electron drops from zero energy to ground state, calculate the frequency of the emitted radiation.
[h = 6.6 x 10^-34 Js]

A 5.0 x 1016 Hz
B 2.0 x 1016 Hz
C 5.0 x 1015 Hz
D 2.0 x 1015 Hz
E No correct option

Question 1524:

JAMB 2008

Convex mirror are used as driving mirrors because images formed are?

A Erect, virtual and diminished
B Erect, real and diminished
C Erect, virtual and magnified
D Inverted virtual and diminished

Question 1525:

Two cars moving in the same direction have speeds of 100 kmh^-1 and 130 kmh^-1 what is the velocity of the faster car as measured by an observer in the slower car?

A 30 kmh-1
B 130 kmh-1
C 200 kmh[sup][/sup]
D 230 kmh-1