No.
Yes, the speed of sound does change with altitude. In general, the speed of sound increases with higher altitudes due to the decrease in air density.
No, sound velocity does not change based on sound frequency in a uniform medium. In a medium with a constant temperature and pressure, the speed of sound remains constant regardless of the frequency of the sound waves.
No, the speed of sound is constant in a medium, so the speed of sound heard by an observer staying in one spot does not change if the source of the sound is moving. The frequency and wavelength of the sound may be affected by the motion of the source, but not the speed.
Yes, it affects the density of air and thus the speed of sound in air.
A change in temperature will result in a change in the speed of sound. The frequency of a flute organ pipe is proportional to the speed of sound. For example, an increase in temperature will cause an increase in the speed of sound, and hence the pitch of the pipe will go up. A change of about 4oC will cause a change in the pipe's sound frequency of about 1%. That compares with a change of 6% between adjacent notes on the keyboard. Hence such a change would be significant.The same effect occurs for the woodwind and brass instruments.
Speed is that parameter which doesn't change.
Yes you can change the speed of sound. IF you change the medium the speed changes. IF you change the density of the medium it changes. IF you change the temperature of the medium the speed changes.
Speed of sound depends on the density of the medium. As temperature increases density decreases due to expansion in the volume. Hence speed of sound gets affected by the change in temperature. Speed of sound is directly proportional to the square root of the temperature of the medium.
No, the speed of sound in a medium is constant and does not change based on the volume of the sound. The intensity or loudness of a sound is related to the amplitude of the sound wave, not its speed.
The speed, and therefore also the wavelength (for sound of a given frequency), are affected by temperature.
yes it is changing. It's increasing with the temperature.
Yes, it is faster