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1191

If a current of 2.5A flows through an electrolyte for 3 hours and 1.8g of a substance is deposited, what is the mass of the substance that will be deposited if a current of 4A flows through it for 4.8 hours?

A. 2.4g
B. 3.2g
C. 4.6g
D. 4.8g

View Answer & Discuss (4) JAMB 2013

1192

Calculate the energy of the third level of an atom if the ground state energy is - 24.8eV

A. -9.20eV
B. -8.20eV
C. -2.75eV
D. -1.75eV

View Answer & Discuss (3) JAMB 2013

1193

In photo-emission, the number of photo-electrons ejected per second depends on the?

A. frequency of the beam
B. work function of the metal
C. threshold frequency of the metal
D. intensity of the beam

View Answer & Discuss (7) JAMB 2013

1194

The particle nature of light is demonstrated by the

A. photoelectric effect
B. speed of light
C. colours of light
D. diffraction of light

View Answer & Discuss (9) JAMB 2013

1195

The energy of a photo having a wavelength of 10^-10m is
(h= 6.63 x 10 ^-34Js, c =3.0 x 10 ⁸ms^-1)

A. 2.0 x 10 ^-15J
B. 1.7 x 10 ^-13J
C. 2.0 x 10 ^-12J
D. 1.7 x 10 ^-12J

View Answer & Discuss JAMB 2013

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