One of the following is a scalar quantity?
weight
momentum
potential energy
displacement
Correct answer is C
Examples of scalar quantities are mass, energy, distance, charge, volume, time, speed, and the magnitude of physical vectors in general
co-ordinate bonds
electrovalent bonds
a substance free of bonds
covalent bonds
Correct answer is D
It's generally created using silicon, germanium, or other pure elements.
Semiconductors are created by adding impurities to the element.
The conductance or inductance of the element depends on the type and intensity of the added impurities.
The electrons surrounding each atom in a semiconductor are part of a covalent bond
The main factor which affects the speed of sound wave is the?
properties of the medium
amplitude of the sound wave
intensity of the sound wave
loudness of the sound wave
Correct answer is A
Factors Affecting The Speed of Sound
2.5 KW
80 KW
25 KW
50 KW
Correct answer is D
where force = f, mass = m, acceleration = a, velocity = v, time = t
Force = m * a → m * \(\frac{Δv}{t}\)
Power = f * v
P = m * \(\frac{v}{t}\) * v = m * \(\frac{v^2}{t}\)
p = \(\frac{1600 * 25^2}{20}\)
p = 50,000 or 50 KW
7.06 x 10\(^{3}\)J
5.38 x 10\(^{3}\)J
6.72 x 10\(^{3}\)J
1.35 x 10\(^{3}\)J
Correct answer is C
quantity of heat = mass * Specific latent heat → 20 * 336
quantity of heat = 6720j or 6.72 x 10\(^{3}\)J