A.because
B.because of
C.though
D.in spite of

A.42
B.45
C.36
D.54

A.46 dB.
B.44 dB.
C.54 dB.
D.50 dB.

A.\(\frac{7}{{120}}\,\,A\).
B.\(\frac{{11}}{{120}}\,\,A\).
C.\(\frac{7}{{240}}\,\,A\).
D.\(\frac{{11}}{{240}}\,\,A\).

A.2,5 J.
B.0,05 J.
C.0,5 J.
D.0,25 J.

A.50 cm/s.
B.120 cm/s.
C.130 cm/s.
D.170cm/s.

A.10
B.11
C.8
D.9

A.\({A_1} > 2{A_2}.\)
B.\({A_1} = 2{A_2}.\)
C.\({A_1} < {A_2}.\)
D.\({A_1} = {A_2}.\)

A.580 nm.
B.550 nm
C.600 nm.
D.530 nm.

A.\(2\sqrt 3 \,\,cm.\)
B.4 cm.
C.2 cm.
D.\(4\sqrt 3 \,\,cm.\)