It required a pan of water and a means of generating two separate waves, each emanating from a slit in a partition in a tray of water. A linear wave was generated behind the partition and two waves of water emerged through the slits as the wave continued as two waves fanning out in concentric circular patterns.
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This section of the site gives you information about the different ways of contacting HMRC about tax credits. It also gives information about security procedures in place when contacting the tax credits helpline. The main telephone number is the tax credit helpline: 0345 300 3900 (textphone 0345 300 3909). From abroad, you can ring +44 2890 538 192. The helpline is open 8am-8pm, Mondays to Fridays, 8am-4pm on Saturdays and 9am -5pm on Sundays (closed Christmas Day, Boxing Day and New Yearâs Day).