Increasing the frequency of a sound wave produces a sound with
higher pitch
longer wavelength
more overtones
reduced loudness
Correct answer is A
The pitch of a sound is determined by its frequency. Higher frequencies correspond to higher pitches. For example, a high-pitched sound like a whistle has a higher frequency than a low-pitched sound like a drum.
\(\frac{qBr}{m}\)
\(\frac{mr}{qB}\)
\(\frac{qm}{Br}\)
\(\frac{mq}{r}\)
Correct answer is A
F = qvB ( force on moving charge in a magnetic field) F = \(\frac{mv^2}{r}\)
equating F
qvB = \(\frac{mv^2}{r}\)
qB = \(\frac{mv}{r}\)
qBr = mv
Therefore, v = \(\frac{qBr}{m}\)
300 + 56\(\frac{a}{2}\)
300 + \(\frac{225a}{2}\)
300 + \(\frac{225}{2a}\)
300a + \(\frac{225}{2}\)
Correct answer is B
u = 20 ms-1, t = 15 s
\(S = ut + 1/2 at^2\)
S = 20(15) + \(\frac{1}{2}× a × 15^2\)
∴ S = 300 + 225\(\frac{a}{2}\)
In a controlled thermal fission reactor, the use of control rods will not affect the
energy generated in the nuclear reactor
rate of production of the neutrons.
speed of the neutrons released on fission.
amount of radiation produced in the nuclear reactor.
Correct answer is C
In a controlled thermal fission reactor, control rods are used to absorb excess neutrons and thus control the rate of the nuclear reaction. They do not affect the speed of the neutrons released on fission. The speed of the neutrons is determined by the nature of the fission process itself, not by the control rods.
The process of producing electric current by a changing magnetic field is referred to as
magnet induction
electromagnetic induction
flux linkage
electrostatic induction
Correct answer is B
The process of producing electric current by a changing magnetic field is referred to as electromagnetic induction.
Electromagnetic induction is a phenomenon in which a voltage is generated in a conductor when it is exposed to a changing magnetic field. This voltage can then be used to drive an electric current.