An ultrasonic probe working inside the same body tissue increases its operating frequency from 2MHz to 4MHz. What happens to the wavelength and the axial resolving power of the sound in the tissue (speed of sound remains unchanged)?
(a) Wavelength halves; resolution worsens
(b) Wavelength remains unchanged; resolution improves
(c) Wavelength halves; resolution improves
(d) Wavelength doubles; resolution unchanged