A.40 W/m2.
B.104 W/m2.
C.10-4 W/m2.
D.10-8 W/m2.

A.\({n_d} < {n_t} < {n_c}\).
B.\({n_d} < {n_c} < {n_t}\).
C.\({n_t} < {n_c} < {n_d}\).
D.\({n_t} < {n_d} < {n_c}\).

A.50π Hz.
B.100π Hz.
C.100 Hz.
D.50 Hz.

A.sector
B.desert
C.willing
D.diverse

A.sector
B.desert
C.willing
D.diverse

A.immense
B.full
C.spacious
D.huge

A.monotonous
B.demanding
C.boring
D.fascinating

A.monotonous
B.demanding
C.boring
D.fascinating

A.ingredient
B.optimistic
C.traditional
D.significant

A.I am not sure whether Nancy was at home last night or not.
B.No one knows whether Nancy was at home last night.
C.Nancy should have been at home last night.
D.Nancy must have been at home last night.