Which of the following statements about the process of melting of a solid are true? The temperature of the solid will?
I. remain steady until melting starts. ll. keep rising until melting starts, Ill remain steady as melting proceeds. V, keep rising as melting proceeds. A. II and llI only B. IlI and IV only C. I, Il and Ill only D. ll and IV only Correct Answer: Option B = IlI and IV...
An electron of mass 9.1x 10^31 kg is travelling at a speed of 2.0 x 10^6ms¯¹. Calculate the associate wavelength of the electron. [h = 6.6. x 10^34 Js]
A. 3.63 x1010 m B. 3.63 x 10−8 m C. 3.63 x 10−7 m D. 6.89 x 10−4 m Correct Answer: Option A = 3.63 x1010 m Using ½mv2 = hf
A ray of light travels obliquely from a less dense medium to a denser medium. Which of the following statements is true about the light?
A. The wavelength of the light increases in the second medium B. The speed of the light increases in the second medium C. The light refracts towards the normal D. There Is a change in the frequency of the light Correct Answer: Option C = The light refracts towards the...
An a.c. generator can be converted to a d.c. electric motor by replacing the
A. slip rings with a split ring and connecting a battery B. split ring with slip rings and connecting a battery C. a.c. with d.c. source and connecting slip rings D. a.c. with d.c. source and connecting split rings Correct Answer: Option A = slip rings with a split...
Water waves have a wavelength of 3.6cm and speed of 18cms¯¹ in deep water. If the waves enter shallow water with wavelength of 2.0cm, calculate the speed of the waves in the shallow water.
A. 0.4cms−1 B. 2.5cms−1 C. 10.0cms−1 D. 10.8cms−1 Correct Answer: Option A = 0.4cms−1Products
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