Fill in the Blanks:-
(a) The time period of a wave is 2seconds. Its frequency is____________.
(b) If a drum is beaten hard, its loudness _____________.
(c) A tuning fork produces sound of ___________ frequency.
(d) Drying of clothes is due to ________ of water.
(e) Increase in length of a solid due to increase in temperature is called ________
expansion.
(f) Boiling occurs at ________ temperature.
(g) Liquids expand ____________ than the solids.
(h) A longer rod expands __________ than a shorter rod on being heated to the same
temperature.
(i) The energy of a body is its capacity to do ___________.
(j) 1 Kilo Joule = ___________ Joule.
Answers
Explanation:
a. T is the time it takes for one complete oscillation , it is measured in seconds. All waves, including sound waves and electromagnetic waves , follow this equation. For example, a wave with a time period of 2 seconds has a frequency of 1 ÷ 2 = 0.5 Hz.
b. If a drum is beaten hard, its loudness increases.
c. 440 Hz
Currently, the most common tuning fork sounds the note of A = 440 Hz, the standard concert pitch that many orchestras use. That A is the pitch of the violin's second string, the first string of the viola, and an octave above the first string of the cello.
d. When a wet object dries, it is because the liquid water that is on the object evaporates to water vapor and diffuses out into the air. On the molecular scale, object wetness consists of many water molecules loosely and non-statically bonded to each other in liquid form, as well as bonded to the object.
e. linear expansion
Since solids have a definite shape, each linear dimension of the solid increases by a proportional amount for a given temperature increase. The amount that a unit length along any direction of a substance increases for a temperature increase of one degree is called the coefficient of linear expansion of the substance.
f. The boiling point of a liquid varies according to the applied pressure; the normal boiling point is the temperature at which the vapour pressure is equal to the standard sea-level atmospheric pressure (760 mm [29.92 inches] of mercury). At sea level, water boils at 100° C (212° F).
g. Liquids expand for the same reason, but because the bonds between separate molecules are usually less tight they expand more than solids. This is the principle behind liquid-in-glass thermometers. An increase in temperature results in the expansion of the liquid which means it rises up the glass.
h. A longer rod expands more than a shorter rod on being heated to the same temperature
I. Energy and Work Energy is the capacity to do work or to produce heat. Internal energy is the sum of kinetic energy and the potential energy.
j. 1000 joules