2009 - JAMB Physics Past Questions and Answers - page 5

When the adhesion of liquid molecules to the glass is more than the cohesion of the liquid, the liquid will wet glass.

Radiation is the method of heat transfer without any unit ervening venue

The speed of sound is highest in solid, being about 500, units in steel rod

The quality of a note is a characteristic that distinguishes it from note of the same frequency played by another musical instrument.

The sun and stars are self luminous object.

u = 5 cm , f = 10 cm, v = ?

(1)/v + (1)/u = (1)/f

(1)/v + (1)/5 = (1)/10

= (1)/v = (1)/10 = (1)/5 = (1 - 2)/10 = (1)/10

∴ v = - 10 cm

∴ The image is 10 cm behind the mirror

f = -12 cm, v = - 6 cm

(1)/v + (1)/u =(1)/f

(1)/-6 + (1)/u = (1)/-12

(1)/u = (1)/-12 + (1)/6 = (1 + 2)/12 = (1)/12

∴ u = 12 cm

Sin c = (1)/n

= (1)/1.51 = 0.6622

∴ c = sin +0.6622 = 41.47

Since 1.51, the refractive index of X is greater than 1.33, the refractive index of y, the speed of light in y is higher than that in X