Unit Test — Cumulative exam Answers
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When light from one source, X, strikes a metal, electrons are ejected. When light from another source, Y, strikes the same metal, electrons are not ejected.
A
Light from source X has a higher intensity than light from source Y.B
Light from source X has a lower intensity than light from source Y.C
Photons of light from source X carry more energy than photons of light from source Y.D
Photons of light from source X carry less energy than photons of light from source Y.
23
A lab cart with a mass of 15 kg is moving with constant velocity, v, along a straight horizontal track. A student drops a 2 kg mass into it from directly above, and the cart continues moving.
A
15vi + 2vf= 15(0)+ 2viB
15vi + 2(0) = 15vf + 2(0)C
15vi + 2(0) = (15 + 2)vfD
15(0) + 2vi = (15 + 2)vf24
A longitudinal wave is shown.
A
AB
BC
CD
D25
Which is true of a step-down transformer but not a step-up transformer?
A
The core is made of copper and the coils are made of iron.B
The core is made of iron and the coils are made of copper.C
The primary winding has fewer coils than the secondary winding.D
The primary winding has more coils than the secondary winding.Did you find these answers helpful?
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