If the intensity of a sound is increased by a factor of 10, the sound level is increased by ___ dB.

If the sound level is increased 20 dB, the intensity of the sound is increased by a factor of ___.

The following information pertains to questions 3-5.

While tuning a guitar, one finds it necessary to tighten one of the strings of the guitar. As a result of tightening the string, . . .

. . . the speed of a transverse wave on the string ___.

. . . the wavelength of the longest wavelength standing wave which can exist on the string ___.

. . . the fundamental frequency of the string ___.

The longest wavelength that can exist as a standing wave on a string 2.0 m long that is tied at both ends is ___ m.

The longest wavelength that can exist as a standing wave in an organ pipe 2.0 m long that is open on one end and closed on the other is ___ m.

The longest wavelength that can exist as a standing wave in an organ pipe 2.0 m long that is open on both ends is ___ m.

The following information pertains to questions 9 and 10.

You are caught in a narrow median of a street and a small sports car is approaching you at a constant speed of 40 m/s. The engine of the car is emitting a sound at a constant frequency of 100 Hz as heard by the driver of the car. You measure the speed of the sound of the engine and determine it to be 340 m/s on this windless day.

The pitch of the sound of the engine that you hear as the car approaches you is ___ 100 Hz.

After the car passes you and continues up the street with the same constant speed, you again measure the speed of the engine sound and find it to be ___ 340 m/s.

The following information pertains to questions 11 and 12.

Two waves of the same speed, same frequency and same wavelength moving in the same medium in the same direction at the same time have amplitudes of 6 cm and 2 cm respectively.

If the waves are in phase, the amplitude of the resulting wave will be ___ cm.

If the two waves are 180^o out of phase, the amplitude of the resulting wave will be ___ cm.