Which of the following units is equivalent to the watt?
kgms-2
kgm2s-3
kgm2s-2
kgm2s-1
Correct answer is B
\(Power = \frac{\text{Work done}}{time}\)
= \(\frac{Force \times distance}{time}\)
= \(\frac{mass \times acceleration \times distance}{time}\)
= \(\frac{kg \times m \times m}{s^{2} \times s}\)
= \(kgm^{2} s^{-3}\)
The rising of a liquid in an open and ended glass tube of narrow bore is
osmosis
adhesion
capillarity
surface tension
Correct answer is C
No explanation has been provided for this answer.
alpha particles
beta particle
gamma radiation
X-radiation
Correct answer is B
β Particles are equivalent to electrons but arise from radioactive decay of unstable atoms. They are emitted with a continuous range of energies up to a maximum that is characteristic of each radionuclide. Electrons have a greater range and penetrating power, but much less ionizing potential compared with α particles.
Beta particles are deflected by a magnetic field in an opposite direction to alpha particles confirming they must hold a charge opposite to alpha particles.
Which of the following arrangements of radiations is in the order of decreasing penetrating power?
\(\alpha, \beta, \gamma\)
\(\alpha, \gamma, \beta\)
\(\gamma, \beta, \alpha\)
\(\beta, \gamma, \alpha\)
Correct answer is C
No explanation has been provided for this answer.
Which of the following statements about X-rays is correct? X-rays
are produced when a metal surface is irradiated with ultraviolet light
are produced when a metal target is used to block fast moving electrons
have long wavelengths and are therefore very penetrating
are not part of the electromagnetic spectrum
Correct answer is B
No explanation has been provided for this answer.