Question 796:

• JAMB 1994

If light with photon energy 2eV is incident suitably on the surface of a metal with work function 3eV, then

A. No electron will be emitted
B. The few electrons emitted will have a maximum kinetic energy of 1eV
C. The few electrons emitted will have a maximum kinetic energy of 3eV
D. Many electrons will be emitted

Question 797:

• JAMB 1994

A spring of length 25cm is extended to 30cm by a load of 150N attached to one of its end, what is the energy stored in the spring?

A. 3750J
B. 2500J
C. 3.75J
D. 2.50J

Question 798:

• JAMB 1994

What is the reading of the vernier calipers shown above

A. 1.79cm
B. 1.73cm
C. 1.39cm
D. 1.34cm

Question 799:

• JAMB 1994

The fig above shows a uniform wood of weight 200Nand length 50m. It is pivoted at one end and suspended by a cord at the other end at an angle of 30 degrees to the wood. calculate the tension in the cord if the wood is horizontal

A. 10N
B. 20N
C. 100N
D. 200N

Question 800:

• JAMB 1994

In the fig above if the atmospheric pressure is 760mm, the pressure of the chamber G is

A. 660mm
B. 690mm
C. 830mm
D. 860mm