The energy of an electron in a hydrogen atom in the n=2 state is given by E_n = -13.6/n^2 = -13.6/4 = -3.4 eV.

Using the Rydberg formula, the wavelength for the transition from n=3 to n=2 is approximately 486 nm.

The energy of the emitted photon is highest for the transition from n=2 to n=1, as it involves the largest energy difference.

The energy of the photon emitted is highest for the transition from n=2 to n=1, as it involves the largest energy difference.

The energy of the emitted photon is highest for the transition from n=2 to n=1, as it involves the largest energy difference.

In a knockout format, one team is eliminated in each match, so 31 matches are needed to determine a single winner from 32 teams.

In a knockout tournament, one team is eliminated in each match. Therefore, to determine a winner from 32 teams, 31 matches are needed.

In a knockout tournament, one team is eliminated in each match. To find a winner among 64 teams, 63 matches are needed.

In a knockout format, losing a match results in elimination from the tournament.

In a knockout tournament, the number of matches needed is always one less than the number of teams, so 16 - 1 = 15.

In a knockout tournament, the number of matches required to determine a winner is always one less than the number of teams. Therefore, for 16 teams, 16 - 1 = 15 matches are needed.

In a knockout tournament, the number of matches needed is always one less than the number of teams, so 32 - 1 = 31.

Relative error = (Uncertainty / Measured value) * 100 = (0.05 / 1.2) * 100 = 4.17%.

Percentage uncertainty = (absolute uncertainty / measured value) * 100 = (5 / 340) * 100 ≈ 1.47%.

Total uncertainty = (2 m/s) / 2 = ±1 m/s.

In a league format with 4 teams, each team plays 3 matches against each of the other 3 teams. Total matches = 4 * 3 / 2 = 6, and since each match is played 3 times, total = 6 * 3 = 18.

In a league format, each match involves two teams. Therefore, the total number of matches is (6 teams * 4 matches) / 2 = 12 matches.

Each match involves 2 teams, so the total number of matches = (10 teams * 4 matches) / 2 = 20.

Each match involves 2 teams, so total matches = (12 teams * 5 matches) / 2 = 30.

Each team plays 4 other teams twice, so total matches = 5 * 4 / 2 * 2 = 20.

Each team plays 4 other teams twice, so total matches = 5 * 4 / 2 * 2 = 20.

40% of 60 = 24. Members not from ruling party = 60 - 24 = 36.

The number of books that are only fiction is calculated by subtracting the number of books that are both from the total fiction books: 50 - 10 = 40.

The total increase is 10°C over 3 days, so the average daily increase is 10/3 = 3.33°C, which rounds to 3°C.

Average temperature = (30 + 32 + 31 + 29 + 28 + 33 + 34) / 7 = 31°C.

The common difference is 10 - 5 = 5.

Since X is to the left of Y and Z is to the right of Y, it follows that X must be to the left of Z.

The order R, S, T, U satisfies the condition of R being to the left of S and T being to the right of R.

If A is 5th from the left and B is 3rd from the right, there are 9 people in total.

The arrangement is X, Z, Y. Therefore, Z is behind Y.