Physics questions and answers

Physics Questions and Answers

If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.

2,126.

A wave has an amplitude equal to 4.0m, angular speed \(\frac{1}{3} \pi\) rads-1 and phase angle \(\frac{2}{3} \pi\) rad. The displacement y of the wave particle is given as

A.

y = 4 sin \(\frac{\pi}{3}\)(t + 2)

B.

y = 4 sin \(\frac{\pi}{3}\)(t + \(\frac{2}{\pi}\))

C.

y = 4 sin \(\frac{\pi}{3}\) (2t + 1)

D.

y = 4 sin \(\frac{\pi}{3}\)(t + 2)

Correct answer is C

No explanation has been provided for this answer.

2,127.

A periodic pulse travels a distance of 20.0m in 1.00s. If its frequency is 2.0 x 103Hz. Calculate the wavelength.

A.

1.0 x 10-3m

B.

1.0 x 10-2m

C.

2.0 x 10-2m

D.

1.0 x 102m

Correct answer is B

No explanation has been provided for this answer.

2,128.

The temperature at which the saturated vapour pressure of a liquid is equal to the external atmospheric pressure is known as its

A.

dew point

B.

boiling point

C.

lower fixed point

D.

tripple point

Correct answer is B

No explanation has been provided for this answer.

2,130.

A piece of metal of mass 50g is cooled from 80oC to 20oC. Calculate the amount of heat lost. (specific heat capacity of the material of metal = 450Jkg-1K-1)

A.

4.50 x 103J

B.

2.25 x 103J

C.

1.80 x 103J

D.

1.35 x 103J

Correct answer is D

No explanation has been provided for this answer.