Write a paragraph predicting future developments concerning world population using the ideas below;
Write a 'police description' of a person you know well.
Why do electrons acquire a steady drift velocity?
Why heat is generated across a resistor when the electric field is applied?
What are the difference between active absorption and passive absorption?
What is the difference between transpiration and guttation?
Distinguish between interference and diffraction?
Define intensity of a sound. Show that the intensity of a sound for a given frequency is directly proportional to the square of amplitude of the vibration.
State and explain the principle of superposition and formation of stationary waves. Show that the frequency of the fundamental note of a closed organ pipe is half as compared to that of an open organ pipe of the same length.
A source of the sound of frequency 512 Hz emits waves of wavelength 670 mm in the air at 20°C. What is the velocity of sound in air at this temperature? What would be the wavelength of sound from the source in the air at 0°C?
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