T or F 1. The energy of a yellow photon is greater than the energy of an x-ray photon. The Earth's atmosphere is transparent to visible light.

Please help. T or F

1.      The energy of a yellow photon is greater than the energy of an x-ray photon.

2.      The Earth's atmosphere is transparent to visible light.

3.      Earth's atmosphere is opaque to ultraviolet light because the ozone in the upper atmosphere absorbs ultraviolet photons.

4.      Radio waves with a wavelength of 21 cm are used to detect atomic hydrogen.