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New answer posted
a year agoContributor-Level 10
2.6
(a) The least count of a vernier calliper = 0.1 mm
(b) The least count of the screw gauge = 1/100 mm = 0.01 mm
(c) The least count of the optical instrument = wave length of the light = 10-5cm = 10-3 mm = 0.001 mm
Hence the answer is (c)
New answer posted
a year agoContributor-Level 10
2.4
(a) Atoms are very small compared to a cricket ball
(b) Compared to a car on a busy city road, a jet plane moves with great speed
(c) When compared to the average mass of a human being, mass of Jupiter is very large.
(d) When compared to the air inside a football, the air inside this room contains a large number of molecules
(e) A proton has higher mass compared to that of an electron
(f) The speed of sound is much smaller when calling your friend from your balcony than signaling him with a torch light
New answer posted
a year agoContributor-Level 10
2.1
(a) The volume of a cube of side 1 is equal to
The volume of the cube = 1 cm * 1 cm * 1 cm = 1 cm3
1 cm3 = 1 * 10-6 m3
(b) The surface area of a solid cylinder of radius 2.0 cm and height 10.0 cm is equal to1.25 * 104 (mm)2
The surface area of a solid cylinder = 2? r (r+)h, where r = 2.0 cm = 20 mm, h = 10 cm = 100 mmSurface area = 2 * 22/7 * 20 * (100 +20) = 1.51 *
(c) A vehicle moving with a speed of 18 km h–1 covers 5 m in 1 s
Vehicle speed = 18 km/h = 18000/3600 m/s = 5 m/s
(d) The relative density of lead is 11.3. Its density is 11.3 g cm–3 or 11.3 * 103.kg m–3.
Relative density o
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a year agoBeginner-Level 5
The Davisson-Germer experiment was conducted to test the De-broglie hypothesis and know wave nature of electrons. In this experiment, a beam of electrons was emitted from an electron gun with known acceleration to strike a nickel crystal placed inside a vacuum chamber.
After striking the surface, electrons are scattered from the crystal surface at different angles. The diffraction pattern obtained through this experiment was similar to that produced by X-rays, which is wave.
The Davisson-Germer experiment provided the first experimental proof of the wave nature of matter and de Broglie's hypothesis right.
New answer posted
a year agoContributor-Level 10
Electromagnetic waves do not require a medium to propagate because they generate self-sustaining oscillations of magnetic and electric fields. Hence, it can travel through the vacuum of space. A changing magnetic field generates an electric field and vice versa. This property allows the wave to carry energy across space. The phenomenon is applicable to sunlight and other forms of EM radiation that travel through space to reach Earth. They cover millions of kilometers while reaching Earth. The EM wave theory is fundamental to understanding phenomena like cosmic observations, satellite communication, and solar radiation.
New answer posted
a year agoContributor-Level 10
The entire range of electromagnetic radiation, arranged to increase and decrease the wavelength is called the electromagnetic (EM) spectrum. In the following order, it includes - radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. All these regions have unique properties and applications. For example, X-rays used in medical imaging, visible light in everyday vision, infrared in remote controls and thermal imaging and radio waves are used in communication. This is an important concept that helps in classifying and utilizing different EM waves.
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