Helium produces the following atomic emmision spectrum lines 388.8 447.1 471.3 492.1 501.5 504.7 587.5 667.8 686.7 706.5 728.1 781.3 for each of these wavelengths determine the corresponding frequency

Apositive charge moves in the direction of an electric field. which of the following statements are true? check all that apply. check all that apply. 1.the potential energy associated with the charge decreases. 2. the electric field does positive work on the charge. 3. the electric field does negative work on the charge. 4. the potential energy associated with the charge increases. 5. the electric field does not do any work on the charge. 6. the amount of work done on the charge cannot be determined without additional information.

How many neutrons does element x if it’s atomic number is 28 and its mass number is 87

Using gravity, an elephant can pull a mouse towards it from the ground. true or false explain why. will give brainliest if answered fast and the best explanation