What is the energy of an X-ray with a frequency of 6.35 x 108 Hz?

This chart represents the melting point of several substance. what besy explains the high melting point of the salt?

Why does a red shoe appear red in daylight

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line