The sunâs surface vibrates from internal pressure waves reflecting off of the photosphere and passing through the solar interior. since these waves penetrate deep inside the sun, an analysis of the vibrations these waves cause at the surface can reveal unique information about the solar interior. the science of studying the vibrations on the surface of the sun is known as helioseismology. if you were a helioseismologist, which of the following observational methods could you use to obtain information about the solar interior? (a) determine the composition of the solar surface(b) measure doppler shifts in solar spectral lines(c) measure solar surface temperatures(d) determine the wavelengths and frequencies of individual pressure waves