Question 4151:

• JAMB 2021

If the frequency of an emitted x-ray is 1.6 x 10\(^{16}\)Hz, the accelerating potential is?

[e = 1.6 x 10\(^{-19}\)J, h = 6.63 x 10-\(^{34}\)Js]

A. 6630.0V
B. 663.0V
C. 66.3V
D. 6.6V

Question 4152:

• JAMB 2021

Which of the following is not correct about the molecules of a substance in a gaseous state. They?

A. Are in a constant state of motion
B. Have different speeds
C. Have a temperature which is measured by the average kinetic energy
D. The collision between the gases is perfectly inelastic

Question 4153:

• JAMB 2021

A given mass of gas has a pressure of 80 Nm\(^{-2}\) at a temperature of 47 C. If the temperature is reduced to 27 C with volume remaining constant, the new pressure is?

A. 46.0 Nm\(^{-2}\)
B. 75.0 Nm\(^{-2}\)
C. 80.0 Nm\(^{-2}\)
D. 85.3 Nm\(^{-2}\)

Question 4154:

• JAMB 2021

0.5kg of water at 10ºC is completely converted to ice at 0ºC by extracting (88000) of heat from it. If the specific heat capacity of water is 4200jkg\(^{1}\) Cº. Calculate the specific latent heat of fusion of ice.

A. 9.0kjkg\(^{-1}\)
B. 84.0kjkg\(^{-1}\)
C. 134.0kjkg\(^{-1}\)
D. 168.0kjkg\(^{-1}\)

Question 4155:

• JAMB 2021

Which of the following instruments may be used to measure relative humidity?

A. Hydrometer
B. Manometer
C. Hygrometer
D. Hypsometer