Last seen: Jan 25, 2021
In case of attack of jaundice, there would be long-term effects on my body. It is so because jaundice is a disease in which liver is affected. It take...
The three reasons of feeling sick and to go to see a doctor are as follows : having body temperature, having diarrhoea (loose motions), and havi...
(i) Living in hygienic environment. (ii) Getting vaccinated against common infectious diseases.
(i) Better sanitation or clean surroundings (ii) Good economic conditions.
(i) Reflection of sound is similar to reflection of light i.e. Angle of incidence = Angle of reflection. (ii) If we lift the pipe vertically to a sm...
When we give a small jerk a hump is produced and this travels forward. When we give a sharp push continuous disturbance is produced. When we give a pu...
In both the cases, sound will be produced by the tuning fork which produces ripples. But in case (1) ripples are produced which will move up and down ...
Yes, we heard sound. If we touch the ball with tuning fork set into vibration, the ball gets displaced from its mean position and starts moving.
Speed of sound in air = 335 m/s Time required to reach the sound = 2 sec Distance of the source of sound = ? ∴ Speed = ∴ Distance = Speed x T...
Speed of sound in air = 340 m/s Frequency = 20 kHz = 20 x 103 Hz Wavelength = ? ∴ Speed = Wavelength x Frequency v = λ v ∴ λ = = = = 0.01...
(a) The range of crackers sound must be between 20 Hz to 20 kHz. (b) Two diseases that can occur due to noise pollution are heart attack and high bl...
(a) The landing and taking off of the air-planes causes lot of noise pollution which may lead to deafness, high blood pressure and other health proble...
(a) Outer Ear: Pinna, auditory canal and tympanic membrane. Pinna: It collects the sound from the surroundings. Auditory Canal: The sound waves co...
Sound is a mechanical wave and needs a material medium to propagate. It cannot travel in vacuum and can be shown by the following experiment. T...
2s.png (a) Wavelength = distance between two consecutive crests or troughs is 2 cm. (b) Frequency = = = 5 Hz (c) Wave speed = Distance tr...
(a) Loudness is determined by amplitude. (b) Pitch is determined by frequency. The quality or timber of sound helps us to distinguish our friend’s...
Speed of sound The distance travelled by a wave or a point on a wave (compression or rarefaction) per unit time. Speed v = v = Distance = ...
Tone: A sound of single frequency is called a tone. Note: The sound which is produced due to a mixture of several frequencies is called a note. No...
Time between transmission and detection t = 342 s.Speed of ultrasound in seawater = 1531 m/s. Distance travelled by the ultrasound = 2 x depth of se...
Middle ear consist of three small bones called hammer, anvil and stirrup. These three bones receive the sound vibrations and increase the strength of ...