NECO Physics Past Questions & Answers - Page 22

106.

The following are derived units EXCEPT

A.

kg m-3

B.

N

C.

Ns

D.

m3

E.

kg

Correct answer is E

No explanation has been provided for this answer.

107.

An atom radiates 1.5 × 10-19J when an electron jumps from one level to another. What is the wavelength of the emitted radiation? (Planck’s constant 6.6 × l0-34Js ; Speed of light in vacuum = 3.0 × 108ms-1)

A.

1.32 × 10-6m

B.

2.97 × 10-6m

C.

3.30 × 10-6m

D.

6.82 × 10-6m

E.

8.01 × 10m-6

Correct answer is A

No explanation has been provided for this answer.

108.

491 K is equivalent to

A.

273 °C

B.

218 °C

C.

373 °C

D.

491 °C

E.

764 °C

Correct answer is B

No explanation has been provided for this answer.